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updated: 2009/11/06
Publications for: James Biggs, Ralph Martin, Andrew Williams
Perth Observatory staff names are in bold. The list is in descending time order.
Shortcut to non-refereed publications
Shortcut to last publication in each year: 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1991, 1990
| Title: | Interpretation of Strong Short-Term Central Perturbations in the Light Curves of Moderate-Magnification Microlensing Events | |
| Authors: | Han, C.; 77 others; Martin, R.; 9 others; Williams, A. and 1 other | |
| Journal: | The Astrophysical Journal, 705, pp. 1116-1121 (2009). | |
| Publication Date: | 11/2009 | |
| Keywords: | gravitational lensing, planetary systems | |
| DOI: | 10.1088/0004-637X/705/2/1116 | |
| Abstract | ||
| To improve the planet detection efficiency, current planetary microlensing experiments are focused on high-magnification events searching for planetary signals near the peak of lensing light curves. However, it is known that central perturbations can also be produced by binary companions and thus it is important to distinguish planetary signals from those induced by binary companions. In this paper, we analyze the light curves of microlensing events OGLE-2007-BLG-137/MOA-2007-BLG-091, OGLE-2007-BLG-355/MOA-2007-BLG-278, and MOA-2007-BLG-199/OGLE-2007-BLG-419, for all of which exhibit short-term perturbations near the peaks of the light curves. From detailed modeling of the light curves, we find that the perturbations of the events are caused by binary companions rather than planets. From a close examination of the light curves combined with the underlying physical geometry of the lens system obtained from modeling, we find that the short timescale caustic-crossing feature occurring at a low or a moderate base magnification with an additional secondary perturbation is a typical feature of binary-lens events and thus can be used for the discrimination between the binary and planetary interpretations. | ||
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| Title: | Extreme Magnification Microlensing Event OGLE-2008-BLG-279: Strong Limits on Planetary Companions to the Lens Star | |
| Authors: | Yee, J. C.; 79 others; Martin, R.; 2 others; Williams, A. and 1 other | |
| Journal: | The Astrophysical Journal, 703, pp. 2082-2090 (2009). | |
| Publication Date: | 10/2009 | |
| Keywords: | gravitational lensing, planetary systems, planetary systems: formation | |
| DOI: | 10.1088/0004-637X/703/2/2082 | |
| Abstract | ||
| We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A ~ 1600 on 2008 May 30. The peak of this event exhibits both finite-source effects and terrestrial parallax, from which we determine the mass of the lens, Ml = 0.64 ± 0.10 Msun, and its distance, Dl = 4.0 ± 0.6 kpc. We rule out Jupiter-mass planetary companions to the lens star for projected separations in the range 0.5-20 AU. More generally, we find that this event was sensitive to planets with masses as small as 0.2 MEarth ~ 2 MMars with projected separations near the Einstein ring (~3 AU). | ||
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| Title: | Difference imaging photometry of blended gravitational microlensing events with a numerical kernel | |
| Authors: | Albrow, M. D.; 7 others; Williams, A. and 17 others | |
| Journal: | Monthly Notices of the Royal Astronomical Society, 397, pp. 2099-2105. | |
| Publication Date: | 08/2009 | |
| Keywords: | methods: statistical , techniques: image processing , techniques: photometric | |
| DOI: | 10.1111/j.1365-2966.2009.15098.x | |
| Abstract | ||
| The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with the knowledge of the statistical flux uncertainties. The improved performance of the new algorithm, relative to ISIS2, is demonstrated. | ||
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| Title: | The Murchison Widefield Array: Design Overview | |
| Authors: | Lonsdale, C. J.; 44 others; Williams, A. and 1 other | |
| Journal: | Proceedings of the IEEE, 97, pp.1497-1506. | |
| Publication Date: | 08/2009 | |
| DOI: | 10.1109/JPROC.2009.2017564 | |
| Abstract | ||
| The Murchison Widefield Array (MWA) is a dipole-based aperture array synthesis telescope designed to operate in the 80-300 MHz frequency range. It is capable of a wide range of science investigations, but is initially focused on three key science projects. These are detection and characterization of 3-dimensional brightness temperature fluctuations in the 21cm line of neutral hydrogen during the Epoch of Reionization (EoR) at redshifts from 6 to 10, solar imaging and remote sensing of the inner heliosphere via propagation effects on signals from distant background sources,and high-sensitivity exploration of the variable radio sky. The array design features 8192 dual-polarization broad-band active dipoles, arranged into 512 tiles comprising 16 dipoles each. The tiles are quasi-randomly distributed over an aperture 1.5km in diameter, with a small number of outliers extending to 3km. All tile-tile baselines are correlated in custom FPGA-based hardware, yielding a Nyquist-sampled instantaneous monochromatic uv coverage and unprecedented point spread function (PSF) quality. The correlated data are calibrated in real time using novel position-dependent self-calibration algorithms. The array is located in the Murchison region of outback Western Australia. This region is characterized by extremely low population density and a superbly radio-quiet environment,allowing full exploitation of the instrumental capabilities. | ||
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| Title: | The Extreme Microlensing Event OGLE-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf | |
| Authors: | Gould, A.; 71 others; Martin, R.; & Williams, A. | |
| Journal: | The Astrophysical Journal Letters, 698, pp. L147-L151 (2009). | |
| Publication Date: | 06/2009 | |
| Keywords: | astrometry, gravitational lensing, stars: low-mass, brown dwarfs | |
| DOI: | 10.1088/0004-637X/698/2/L147 | |
| Abstract | ||
| Parallax is the most fundamental technique for measuring distances to astronomical objects. Although terrestrial parallax was pioneered over 2000 years ago by Hipparchus (ca. 140 B.C.E.) to measure the distance to the Moon, the baseline of the Earth is so small that terrestrial parallax can generally only be applied to objects in the Solar System. However, there exists a class of extreme gravitational microlensing events in which the effects of terrestrial parallax can be readily detected and so permit the measurement of the distance, mass, and transverse velocity of the lens. Here we report observations of the first such extreme microlensing event OGLE-2007-BLG-224, from which we infer that the lens is a brown dwarf of mass M = 0.056 ± 0.004 M sun, with a distance of 525 ± 40 pc and a transverse velocity of 113 ± 21 km s-1. The velocity places the lens in the thick disk, making this the lowest-mass thick-disk brown dwarf detected so far. Follow-up observations may allow one to observe the light from the brown dwarf itself, thus serving as an important constraint for evolutionary models of these objects and potentially opening a new window on substellar objects. The low a priori probability of detecting a thick-disk brown dwarf in this event, when combined with additional evidence from other observations, suggests that old substellar objects may be more common than previously assumed. | ||
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| Title: | A systematic fitting scheme for caustic-crossing microlensing events | |
| Authors: | Kains, N.; 27 others; Martin, R.; 8 others; Williams, A. and 7 others | |
| Journal: | Monthly Notices of the Royal Astronomical Society, 395, pp. 787-796. | |
| Publication Date: | 05/2009 | |
| Keywords: | gravitational lensing , methods: miscellaneous , binaries: general , planetary systems , Galaxy: bulge | |
| DOI: | 10.1111/j.1365-2966.2009.14615.x | |
| Abstract | ||
| We outline a method for fitting binary-lens caustic-crossing microlensing events based on the alternative model parametrization proposed and detailed by Cassan. As an illustration of our methodology, we present an analysis of OGLE-2007-BLG-472, a double-peaked Galactic microlensing event with a source crossing the whole caustic structure in less than three days. In order to identify all possible models we conduct an extensive search of the parameter space, followed by a refinement of the parameters with a Markov Chain Monte Carlo algorithm. We find a number of low- χ2 regions in the parameter space, which lead to several distinct competitive best models. We examine the parameters for each of them, and estimate their physical properties. We find that our fitting strategy locates several minima that are difficult to find with other modelling strategies and is therefore a more appropriate method to fit this type of event. | ||
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| Title: | OGLE-2005-BLG-071Lb, the Most Massive M Dwarf Planetary Companion? | |
| Authors: | Dong, Subo; 68 others; Martin, R.; 6 others; Williams, A. and 7 others | |
| Journal: | The Astrophysical Journal, 695, pp. 970-987. | |
| Publication Date: | 04/2009 | |
| Keywords: | Galaxy: bulge, gravitational lensing, planetary systems | |
| DOI: | 10.1088/0004-637X/695/2/970 | |
| Abstract | ||
| We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, the second planet discovered by microlensing and the first in a high-magnification event. These include photometric and astrometric measurements from the Hubble Space Telescope, as well as constraints from higher order effects extracted from the ground-based light curve, such as microlens parallax, planetary orbital motion, and finite-source effects. Our primary analysis leads to the conclusion that the host of Jovian planet OGLE-2005-BLG-071Lb is an M dwarf in the foreground disk with mass M = 0.46 ± 0.04 M_sun , distance D_l = 3.2 ± 0.4 kpc, and thick-disk kinematics v_LSR ~ 103 km s^-1 . From the best-fit model, the planet has mass M_p = 3.8 ± 0.4 M_Jupiter , lies at a projected separation r_? = 3.6 ± 0.2AU from its host, and so has an equilibrium temperature of T ~ 55 K, that is, similar to Neptune. A degenerate model gives similar planetary mass M_p = 3.4 ± 0.4 M_Jupiter with a smaller projected separation, r_? = 2.1 ± 0.1AU, and higher equilibrium temperature, T ~ 71 K. These results from the primary analysis suggest that OGLE-2005-BLG-071Lb is likely to be the most massive planet yet discovered that is hosted by an M dwarf. However, the formation of such high-mass planetary companions in the outer regions of M dwarf planetary systems is predicted to be unlikely within the core-accretion scenario. There are a number of caveats to this primary analysis, which assumes (based on real but limited evidence) that the unlensed light coincident with the source is actually due to the lens, that is, the planetary host. However, these caveats could mostly be resolved by a single astrometric measurement a few years after the event. | ||
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| Title: | AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46 | |
| Authors: | Kiss, L. L.; Szabó, Gy. M.; Balog, Z.; Parker, Q. A. and Frew, D. J. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, 391, pp. 399-404. | |
| Publication Date: | 11/2008 | |
| Keywords: | planetary nebulae: general , open clusters and associations: general | |
| DOI: | 10.1111/j.1365-2966.2008.13899.x | |
| Abstract | ||
| We present new radial velocity measurements of 586 stars in a one-degree field centred on the open cluster M46, and the planetary nebula NGC 2438 located within a nuclear radius of the cluster. The data are based on medium-resolution optical and near-infrared spectra taken with the AAOmega spectrograph on the Anglo-Australian Telescope. We find a velocity difference of about 30kms^-1 between the cluster and nebula, thus removing all ambiguities about the cluster membership of the planetary nebula caused by contradicting results in the literature. The line-of-sight velocity dispersion of the cluster is 3.9 +/- 0.3kms^-1 , likely to be affected by a significant population of binary stars. | ||
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| Title: | A Planetary Nebula around Nova V458 Vulpeculae Undergoing Flash Ionization | |
| Authors: | Wesson, R.; 12 others Frew, D. J. and 14 others | |
| Journal: | The Astrophysical Journal, 688, pp. L21-L24. | |
| Publication Date: | 11/2008 | |
| Keywords: | ISM: Abundances, Stars: Novae, Cataclysmic Variables | |
| DOI: | 10.1086/594366 | |
| Abstract | ||
| Nova V458 Vul erupted on 2007 August 8 and reached a visual magnitude of 8.1 a few days later. Ha images obtained 6 weeks before the outburst as part of the IPHAS Galactic plane survey reveal an 18th magnitude progenitor surrounded by an extended nebula. Subsequent images and spectroscopy of the nebula reveal an inner nebular knot increasing rapidly in brightness due to flash ionization by the nova event. We derive a distance of 13 kpc based on light travel time considerations, which is supported by two other distance estimation methods. The nebula has an ionized mass of 0.2 M_solar and a low expansion velocity: this rules it out as ejecta from a previous nova eruption, and is consistent with it being a ~14,000 year old planetary nebula, probably the product of a prior common envelope (CE) phase of evolution of the binary system. The large derived distance means that the mass of the erupting WD component of the binary is high. We identify two possible evolutionary scenarios, in at least one of which the system is massive enough to produce a Type Ia supernova upon merging. | ||
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| Title: | Limits on additional planetary companions to OGLE 2005-BLG-390L | |
| Authors: | Kubas, D.; 27 others; Martin, R.; 8 others; Williams, A. and 2 others | |
| Journal: | Astronomy and Astrophysics, 483, pp.317-324 | |
| Publication Date: | 05/2008 | |
| Keywords: | stars: planetary systems, gravitational lensing | |
| DOI: | 10.1051/0004-6361:20077449 | |
| Abstract | ||
|
Aims. We investigate constraints on additional planets orbiting the
distant M-dwarf star OGLE 2005-BLG-390L, around which photometric
microlensing data has revealed the existence of the sub-Neptune-mass
planet OGLE 2005-BLG-390Lb. We specifically aim to study potential
Jovian companions and compare our findings with predictions from
core-accretion and disc-instability models of planet formation. We also
obtain an estimate of the detection probability for sub-Neptune mass
planets similar to OGLE 2005-BLG-390Lb using a simplified simulation of
a microlensing experiment. Methods: We compute the efficiency of our photometric data for detecting additional planets around OGLE 2005-BLG-390L, as a function of the microlensing model parameters and convert it into a function of the orbital axis and planet mass by means of an adopted model of the Milky Way. Results: We find that more than 50% of potential planets with a mass in excess of 1 M_J between 1.1 and 2.3 AU around OGLE 2005-BLG-390L would have revealed their existence, whereas for gas giants above 3 M_J in orbits between 1.5 and 2.2 AU, the detection efficiency reaches 70%; however, no such companion was observed. Our photometric microlensing data therefore do not contradict the existence of gas giant planets at any separation orbiting OGLE 2005-BLG-390L. Furthermore we find a detection probability for an OGLE 2005-BLG-390Lb-like planet of around 2{-}5%. In agreement with current planet formation theories, this quantitatively supports the prediction that sub-Neptune mass planets are common around low-mass stars. | ||
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| Title: | MASH-II: more planetary nebulae from the AAO/UKST Ha survey | |
| Authors: | Miszalski, B.; Parker, Q. A.; Acker, A.; Birkby, J. L.; Frew, D. J. and Kovacevic, A. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, 384, pp. 525-534. | |
| Publication Date: | 02/2008 | |
| Keywords: | astronomical data bases: miscellaneous, catalogues, surveys, planetary nebulae: general | |
| DOI: | 10.1111/j.1365-2966.2007.12727.x | |
| Abstract | ||
| We present a supplement to the Macquarie/AAO/Strasbourg Halpha planetary nebulae (PNe) catalogue (MASH), which we denote MASH-II. The supplement consists of over 300 true, likely and possible new Galactic PNe found after re-examination of the entire AAO/UKST Halpha survey of the Southern Galactic Plane in digital form. We have spectroscopically confirmed over 240 of these new candidates as bona fide PNe, and we include other high-quality candidates awaiting spectroscopic confirmation as possible PNe. These latest discoveries largely comprise two distinct groups: small, star like or moderately resolved PNe at one end and mostly large, extremely low surface brightness PNe at the other. Neither group were easy to discover from simple visual scrutiny of the original survey exposures as for MASH but were relatively straightforward to uncover from the digital images via application of semi-automated discovery techniques. We suspect the few PNe still hidden in the Ha survey will lie outside our search criteria or be difficult to find. | ||
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| Title: | Spitzer IRAC Observations of Newly Discovered Planetary Nebulae from the Macquarie-AAO-Strasbourg Ha Planetary Nebula Project | |
| Authors: | Cohen, M.; Parker, Q. A.; Green, A. J.; Murphy, T.; Miszalski, B.; Frew, D. J.; Meade, M. R.; Babler, B.; Indebetouw, R.; Whitney, B. A.; Watson, C.; Churchwell, E. B. and Watson, D. F. | |
| Journal: | The Astrophysical Journal, 669, pp. 343-362. | |
| Publication Date: | 11/2007 | |
| Keywords: | Infrared: ISM, ISM: Planetary Nebulae: General, Radiation Mechanisms: Thermal, Radio Continuum: ISM, Space Vehicles | |
| DOI: | 10.1086/521427 | |
| Abstract | ||
|
We compare Halpha, radio continuum, and Spitzer Space Telescope images of 58 planetary nebulae (PNe) recently discovered by the Macquarie-AAO-Strasbourg Halpha PN Project (MASH) of the SuperCOSMOS Halpha Survey. Using Infrared Array Camera (IRAC) data, we examine the relationships between optical and MIR morphologies from 3.6 to 8.0micron and explore the ratio of mid-infrared (MIR) to radio nebular fluxes, which is a valuable discriminant between thermal and nonthermal emission. MASH emphasizes late evolutionary stages of PNe compared with previous catalogs, enabling study of the changes in MIR and radio flux that attend the aging process. Spatially integrated fluxes are constructed for all MASH PNe observed by the GLIMPSE Legacy Project, using the Halpha morphologies to define the areas of MIR and radio continuum emission observed by the Midcourse Space Experiment (MSX), IRAC, the Molonglo Observatory Synthesis Telescope, and the Very Large Array (VLA). The ratio of IRAC 8.0micron to MSX 8.3micron fluxes provides an assessment of the absolute diffuse calibration of IRAC at 8.0micron. We independently confirm the aperture correction factor to be applied to IRAC at 8.0micron to align it with the diffuse calibration of MSX. The result is in accord with the recommendations of the Spitzer Science Center and with our results from a parallel study of HII regions in the MIR and radio. However, these PNe probe the diffuse calibration of IRAC on a spatial scale of 9''-77'', as opposed to the many-arcminute scale from the HII regions' study. | ||
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| Title: | Multiwavelength study of a new Galactic SNR G332.5-5.6 | |
| Authors: | Stupar, M.; Parker, Q. A.; Filipovic, M. D.; Frew, D. J.; Bojicic, I. and Aschenbach, B. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, 381, pp. 377-388. | |
| Publication Date: | 10/2007 | |
| Keywords: | surveys, supernova remnants, radio continuum: general | |
| DOI: | 10.1111/j.1365-2966.2007.12296.x | |
| Abstract | ||
|
We present compelling evidence for confirmation of a Galactic supernova remnant (SNR) candidate, G332.5-5.6, based initially on identification of new, filamentary, optical emission-line nebulosity seen in the arcsecond resolution images from the Anglo Australian Observatory (AAO)/United Kingdom Schmidt Telescope (UKST) Halpha survey. The extant radio observations and X-ray data which we have independently re-reduced, together with new optical spectroscopy of the large-scale fragmented nebulosity, confirm the identification. Optical spectra, taken across five different, widely separated nebula regions of the remnant as seen in the Halpha images, show average ratios of [NII]/Halpha = 2.42, [SII]/Halpha = 2.10 and [SII] 6717/6731 = 1.23, as well as strong [OI] 6300, 6364 Å and [OII] 3727 Å emission. These ratios are firmly 3within those typical of SNRs. Here, we also present the radio-continuum detection of the SNR at 20/13cm from observations with the Australia Telescope Compact Array (ATCA). Radio emission is also seen at 4850 MHz, in the Parkes-MIT-NRAO (PMN) survey and at 843 MHz from the Sydney University Molonglo Sky Survey (SUMSS) survey. We estimate an angular diameter of ~30 arcmin and obtain an average radio spectral index of alpha = -0.6 ± 0.1 which indicates the non-thermal nature of G332.5-5.6. Fresh analysis of existing ROSAT X-ray data in the vicinity also confirms the existence of the SNR. The distance to G332.5-5.6 has been independently estimated by Reynoso and Green as 3.4 kpc based on measurements of the HI ?21-cm line seen in absorption against the continuum emission. Our cruder estimates via assumptions on the height of the dust layer (3.1 kpc) and using the Sigma-D relation (4 kpc) are in good agreement. | ||
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| Title: | On the Search for Transits of the Planets Orbiting Gliese 876 | |
| Authors: | Shankland, P. D.; Rivera, E. J.; Laughlin, G.; Blank, D. L.; Price, A.; Gary, B.; Bissinger, R.; Ringwald, F.; White, G.; Henry, G. W.; McGee, P.; Wolf, A. S.; Carter, B.; Lee, S.; Biggs, J.; Monard, B.; Ashley, M. C. B. | |
| Journal: | The Astrophysical Journal, 653, pp. 700-707. | |
| Publication Date: | 12/2006 | |
| Keywords: | Stars: Planetary Systems, Planets and Satellites: General, Stars: Individual: Name: Gliese 876 | |
| DOI: | 10.1086/508562 | |
| Abstract | ||
| We report the results of a globally coordinated photometric campaign to search for transits by the P~30 day and P~60 day outer planets of the three-planet system orbiting the nearby M dwarf Gl 876. These two planets experience strong mutual perturbations, which necessitate the use of a dynamical (four-body) model to compute transit ephemerides for the system. Our photometric data have been collected from published archival sources, as well as from our photometric campaigns that were targeted to specific transit predictions. Our analysis indicates that transits by planet c (P~30 days) do not currently occur, in concordance with the best-fit i=50° coplanar configuration obtained by dynamical fits to the most recent radial velocity data for the system. Transits by planet b (P~60 day) are not entirely ruled out by our observations, but our data indicate that it is very unlikely that they occur. Our experience with the Gl 876 system suggests that a distributed ground-based network of small telescopes can be used to search for transits of very low mass M stars by terrestrial-sized planets. | ||
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| Title: | OGLE 2004-BLG-254: a K3 III Galactic bulge giant spatially resolved by a single microlens | |
| Authors: | Cassan, A.; Beaulieu, J.-P.; Fouqué, P.; Brillant, S.; Dominik, M.; Greenhill, J.; Heyrovský, D.; Horne, K.; Jørgensen, U. G.; Kubas, D.; Stempels, H. C.; Vinter, C.; Albrow, M. D.; Bennett, D.; Caldwell, J. A. R.; Calitz, J. J.; Cook, K.; Coutures, C.; Dominis, D.; Donatowicz, J.; Hill, K.; Hoffman, M.; Kane, S.; Marquette, J.-B.; Martin, R.; Meintjes, P.; Menzies, J.; Miller, V. R.; Pollard, K. R.; Sahu, K. C.; Wambsganss, J.; Williams, A.; Udalski, A.; Szymanski, M. K.; Kubiak, M.; Pietrzynski, G.; Soszynski, I.; Zebrun, K.; Szewczyk, O.; Wyrzykowski, L. | |
| Publication: | Astronomy and Astrophysics, Volume 460, Issue 1, December 2006, pp.277-288 | |
| Publication Date: | 12/2006 | |
| Keywords: | gravitational lensing, techniques: high angular resolution, stars: atmospheres, stars:, individual: OGLE 2004-BLG-254 | |
| DOI: | 10.1051/0004-6361:20054414 | |
| Abstract | ||
| Aims. We present an analysis
of OGLE 2004-BLG-254, a high-magnification (Ao ~
60) and relatively short duration (t_E ~ 13.2 days) microlensing event
in which the source star, a Bulge K-giant, has been spatially resolved
by a point-like lens. We seek to determine the lens and source distance,
and provide a measurement of the linear limb-darkening coefficients of
the source star in the I and R bands. We discuss the derived values of
the latter and compare them to the classical theoretical laws, and furthermore
examine the cases of already published microlensed GK-giants limb-darkening
measurements. Methods: We have obtained dense photometric coverage of the event light curve with OGLE and PLANET telescopes, as well as a high signal-to-noise ratio spectrum taken while the source was still magnified by A ~ 20, using the UVES/VLT spectrograph. We have performed a modelling of the light curve, including finite source and parallax effects, and have combined spectroscopic and photometric analysis to infer the source distance. A Galactic model for the mass and velocity distribution of the stars has been used to estimate the lens distance. Results: From the spectrum analysis and calibrated color-magnitude of the event target, we found that the source was a K3 III Bulge giant, situated at the far end of the Bulge. From modelling the light curve, we have derived an angular size of the Einstein ring theta_E ~ 114 muas, and a relative lens-source proper motion mu = theta_E/t_E ~ 3.1 mas/yr. We could also measure the angular size of the source, theta_* ~ 4.5 muas, whereas given the short duration of the event, no significant constraint could be obtained from parallax effects. A Galactic model based on the modelling of the light curve then provides us with an estimate of the lens distance, mass and velocity as D_L ~ 9.6 kpc, M ~ 0.11 Msun and v ~ 145~km s-1 (at the lens distance) respectively. Our dense coverage of this event allows us to measure limb darkening of the source star in the I and R bands. We also compare previous measurements of linear limb-darkening coefficients involving GK-giant stars with predictions from ATLAS atmosphere models. We discuss the case of K-giants and find a disagreement between limb-darkening measurements and model predictions, which may be caused by the inadequacy of the linear limb-darkening law. | ||
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| Title: | Piloting a network of small telescopes | |
| Authors: | Fadavi, M.; Verveer, A.; Aymon, J.; Merlin, D.; Situ, K.; Pennypackker, C.; Biggs, J. D.; White, G.; Gould, A.; Greenberg, G.; Hoette, V.; McCarron, K.; Archer, K.; Pino, F.; Hibbs, M.; Ford, M.; Wetsch, J. | |
| Journal: | Astronomische Nachrichten, Vol.327, Issue 8, p.811-813. | |
| Publication Date: | 09/2006 | |
| Keywords: | telescopes, methods: observational | |
| DOI: | 10.1002/asna.200610686 | |
| Abstract | ||
|
The Pilot Small Telescope Network (PSTN) is a state-of the art system of easily replicable and scalable hardware, software, servers, eXtensible Markup Language (XML) protocols, and network middleware connecting and developing a pilot array of robotic telescopes to one another and the user community. The PSTN is a developmental project that will allow growing access to these telescopes, and make available data to faculty, students and others in an environment of collaboration. The underlying goal of the PSTN is to broaden the quantity and quality of astronomical education and research, particularly with a focus on traditionally underserved populations. | ||
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| Title: | Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing | |
| Authors: | Beaulieu, J.-P.; Bennett, D. P.; Fouqué, P.; Williams, A.; Dominik, M.; Jorgensen, U. G.; Kubas, D.; Cassan, A.; Coutures, C.; Greenhill, J.; Hill, K.; Menzies, J.; Sackett, P. D.; Albrow, M.; Brillant, S.; Caldwell, J. A. R.; Calitz, J. J.; Cook, K. H.; Corrales, E.; Desort, M.; Dieters, S.; Dominis, D.; Donatowicz, J.; Hoffman, M.; Kane, S.; Marquette, J.-B.; Martin, R.; Meintjes, P.; Pollard, K.; Sahu, K.; Vinter, C.; Wambsganss, J.; Woller, K.; Horne, K.; Steele, I.; Bramich, D. M.; Burgdorf, M.; Snodgrass, C.; Bode, M.; Udalski, A.; Szymanski, M. K.; Kubiak, M.; Wieckowski, T.; Pietrzynski, G.; Soszynski, I.; Szewczyk, O.; Wyrzykowski, L.; Paczynski, B.; Abe, F.; Bond, I. A.; Britton, T. R.; Gilmore, A. C.; Hearnshaw, J. B.; Itow, Y.; Kamiya, K.; Kilmartin, P. M.; Korpela, A. V.; Masuda, K.; Matsubara, Y.; Motomura, M.; Muraki, Y.; Nakamura, S.; Okada, C.; Ohnishi, K.; Rattenbury, N. J.; Sako, T.; Sato, S.; Sasaki, M.; Sekiguchi, T.; Sullivan, D. J.; Tristram, P. J.; Yock, P. C. M.; Yoshioka, T. | |
| Journal: | Nature, Volume 439, Issue 7075, pp. 437-440 (2006). | |
| Publication Date: | 01/2006 | |
| DOI: | 10.1038/nature04441 | |
| Abstract | ||
| In the favoured core-accretion model of formation of planetary systems, solid planetesimals accumulate to build up planetary cores, which then accrete nebular gas if they are sufficiently massive. Around M-dwarf stars (the most common stars in our Galaxy), this model favours the formation of Earth-mass (M⊕) to Neptune-mass planets with orbital radii of 1 to 10 astronomical units (AU), which is consistent with the small number of gas giant planets known to orbit M-dwarf host stars. More than 170 extrasolar planets have been discovered with a wide range of masses and orbital periods, but planets of Neptune's mass or less have not hitherto been detected at separations of more than 0.15AU from normal stars. Here we report the discovery of a 5.5+5.5-2.7 M⊕ planetary companion at a separation of 2.6+1.5-0.6AU from a 0.22+0.21-0.11 M⊕ M-dwarf star, where M⊕ refers to a solar mass. (We propose to name it OGLE-2005-BLG-390Lb, indicating a planetary mass companion to the lens star of the microlensing event.) The mass is lower than that of GJ876d (ref. 5), although the error bars overlap. Our detection suggests that such cool, sub-Neptune-mass planets may be more common than gas giant planets, as predicted by the core accretion theory. | ||
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| Title: | Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations | |
| Authors: | Kubas, D.; Beaulieu, J., P.; Coutures, C.; Dominik, M.; Albrow, M. D.; Brillant, S.; Caldwell, J. A. R.; Dominis, D.; Donatowicz, J.; Fendt, C.; Fouqué , P.; Jörgensen, U. G.; Greenhill, J.; Hill, K.; Heinmüller, J.; Horne, K.; Kane, S.; Marquette, J. B.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Vinter, C.; Wambsganss, J.; Watson, R.; Williams, A.; Thurl, C. | |
| Journal: | Astronomy and Astrophysics, Volume 435, Issue 3, June I 2005, pp.941-948 | |
| Publication Date: | 06/2005 | |
| Keywords: | gravitational lensing, stars: atmospheres, stars: binaries: general | |
| DOI: | 10.1051/0004-6361:20042624 | |
| Abstract | ||
| We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M=(0.51 ± 0.15) Msun; and distance of D{L}=(2.9± 0.4) {{kpc}}, the wide binary lens solution requires a rather implausible binary black-hole lens (M › 126 Msun). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations. | ||
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| Title: | Pushing the ground-based limit: 14-mumag photometric precision with the definitive Whole Earth Telescope asteroseismic data set for the rapidly oscillating Ap star HR1217 | |
| Authors: | Kurtz, D. W.; Cameron, C.; Cunha, M. S.; Dolez, N.; Vauclair, G.; Pallier, E.; Ulla, A.; Kepler, S. O.; da Costa, A.; Kanaan, A.; Fraga, L.; Giovannini, O.; Wood, M. A.; Silvestri, N.; Kawaler, S. D.; Riddle, R. L.; Reed, M. D.; Watson, T. K.; Metcalfe, T. S.; Mukadam, A.; Nather, R. E.; Winget, D. E.; Nitta, A.; Kleinman, S. J.; Guzik, J. A.; Bradley, P. A.; Matthews, J. M.; Sekiguchi, K.; Sullivan, D. J.; Sullivan, T.; Shobbrook, R.; Jiang, X.; Birch, P. V.; Ashoka, B. N.; Seetha, S.; Girish, V.; Joshi, S.; Moskalik, P.; Zola, S.; O'Donoghue, D.; Handler, G.; Mueller, M.; Perez Gonzalez, J. M. Solheim, J.-E.; Johannessen, F.; Bigot, L. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, Volume 358, Issue 2, pp. 651-664. | |
| Publication Date: | 04/2005 | |
| Keywords: | stars: individual: HR1217, stars: magnetic fields, stars: oscillations, stars: variables: other | |
| DOI: | 10.1111/j.1365-2966.2005.08807.x | |
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| Title: | PLANET III: searching for Earth-mass planets via microlensing from Dome C? | |
| Authors: | Beaulieu, J. P.; Cassan, A.; Kubas, D.; Albrow, M.; Bennett, D.; Brillant, S.; Caldwell, J. A. R.; Calitz, H.; Cook, K.; Coutures, C.; Dominik, M.; Dominis, D.; Donatowicz, J.; Fouqué , P.; Greenhill, J.; Hill, K.; Hoffman, M.; Horne, K.; Jörgensen, U. G.; Kane, S.; Martin, R.; Mientjes, P.; Menzies, J. M.; Pollard, K.; Sahu, K.; Vinter, C.; Wambsganss, J.; Williams, A. | |
| Journal: | EAS Publications Series, Volume 14, 2005, pp.297-302 | |
| Publication Date: | 00/2005 | |
| DOI: | 10.1051/eas:2005047 | |
| Abstract | ||
|
PLANET, the Probing Lensing Anomaly NETwork, is an international team conducting observations of on-going gravitational microlensing events from five sites in the southern hemisphere. Our primary goal is to detect or to put constraints on sub-stellar companions of M dwarfs from the galactic disk. We report the current status and discuss the future prospects. A 2m robotic telescope at Dome C which would benefit from continuous coverage and dream like seeing (median of 0.27 arcsec) is currently the best option for a ground based aggressive search for Earth-mass planets in the habitable zone. | ||
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| Title: | OGLE-2003-BLG-238: Microlensing Mass Estimate of an Isolated Star | |
| Authors: | Jiang, Guangfei; DePoy, D. L.; Gal-Yam, A.; Gaudi, B. S.; Gould, A.; Han, C.; Lipkin, Y.; Maoz, D.; Ofek, E. O.; Park, B.-G.; Pogge, R. W.; Udalski, A.; Kubiak, M.; Szymanski, M. K.; Szewczyk, O.; Zebrun, K.; Wyrzykowski, L.; Soszynski, I.; Pietrzynski, G.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Cassan, A.; Coutures, C.; Dominik, M.; Donatowicz, J.; Fouqué , P.; Greenhill, J.; Hill, K.; Horne, K.; Jörgensen, S. F.; Jörgensen, U. G.; Kane, S.; Kubas, D.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Wambsganss, J.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 617, Issue 2, pp. 1307-1315. | |
| Publication Date: | 12/2004 | |
| Keywords: | Cosmology: Gravitational Lensing, Stars: Fundamental Parameters | |
| DOI: | 10.1086/425678 | |
| Abstract | ||
| Microlensing is the only known direct method to measure the masses of stars that lack visible companions. In terms of microlensing observables, the mass is given by M=(c2/4G)rEthetaE and so requires the measurement of both the angular Einstein radius thetaE and the projected Einstein radius rE. Simultaneous measurement of these two parameters is extremely rare. Here we analyze OGLE-2003-BLG-238, a spectacularly bright (Imin=10.3), high-magnification (Amax=170) microlensing event. Pronounced finite-source effects permit a measurement of thetaE=650muas. Although the timescale of the event is only tE=38days, one can still obtain weak constraints on the microlens parallax: 4.4AU< rE< 18AU at the 1 sigma level. Together these two parameter measurements yield a range for the lens mass of 0.36Msolar< M< 1.48Msolar. As was the case for MACHO-LMC-5, the only other single star (apart from the Sun) whose mass has been determined from its gravitational effects, this estimate is rather crude. It does, however, demonstrate the viability of the technique. We also discuss future prospects for single-lens mass measurements. | ||
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| Title: | Potential Direct Single-Star Mass Measurement | |
| Authors: | Ghosh, H.; DePoy, D. L.; Gal-Yam, A.; Gaudi, B. S.; Gould, A.; Han, C.; Lipkin, Y.; Maoz, D.; Ofek, E. O.; Park, B.-G.; Pogge, R. W.; Salim, S.; Abe, F.; Bennett, D. P.; Bond, I. A.; Eguchi, S.; Furuta, Y.; Hearnshaw, J. B.; Kamiya, K.; Kilmartin, P. M.; Kurata, Y.; Masuda, K.; Matsubara, Y.; Muraki, Y.; Noda, S.; Okajima, K.; Rattenbury, N. J.; Sako, T.; Sekiguchi, T.; Sullivan, D. J.; Sumi, T.; Tristram, P. J.; Yanagisawa, T.; Yock, P. C. M.; Udalski, A.; Soszynski, I.; Wyrzykowski, L.; Kubiak, M.; Szymanski, M. K.; Pietrzynski, G.; Szewczyk, O.; Zebrun, K.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Cassan, A.; Coutures, C.; Dominik, M.; Donatowicz, J.; Fouqué , P.; Greenhill, J.; Hill, K.; Horne, K.; Jörgensen, U. G.; Kane, S.; Kubas, D.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Wambsganss, J.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 615, Issue 1, pp. 450-459. | |
| Publication Date: | 11/2004 | |
| Keywords: | Astrometry, Cosmology: Gravitational Lensing, Stars: Fundamental Parameters | |
| DOI: | 10.1086/423665 | |
| Abstract | ||
| We analyze the light curve of the microlensing event OGLE-2003-BLG-175/MOA-2003-BLG-45 and show that it has two properties that, when combined with future high-resolution astrometry, could lead to a direct, accurate measurement of the lens mass. First, the light curve shows clear signs of distortion due to the Earth's accelerated motion, which yields a measurement of the projected Einstein radius rE. Second, from precise astrometric measurements, we show that the blended light in the event is coincident with the microlensed source to within about 15 mas. This argues strongly that this blended light is the lens and hence opens the possibility of directly measuring the lens-source relative proper motion murel and so the mass M=(c2/4G)mureltErE, where tE is the measured Einstein timescale. While the light-curve-based measurement of rE is, by itself, severely degenerate, we show that this degeneracy can be completely resolved by measuring the direction of proper motion murel. | ||
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| Title: | Probing the atmosphere of the bulge G5III star OGLE-2002-BUL-069 by analysis of microlensed Halpha line | |
| Authors: | Cassan, A.; Beaulieu, J. P.; Brillant, S.; Coutures, C.; Dominik, M.; Donatowicz, J.; Jörgensen, U. G.; Kubas, D.; Albrow, M. D.; Caldwell, J. A. R.; Fouqué , P.; Greenhill, J.; Hill, K.; Horne, K.; Kane, S.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Vinter, C.; Wambsganss, J.; Watson, R.; Williams, A.; Fendt, C.; Hauschildt, P.; Heinmueller, J.; Marquette, J. B.; Thurl, C. | |
| Journal: | Astronomy and Astrophysics, v.419, p.L1-L4 (2004) | |
| Publication Date: | 05/2004 | |
| Keywords: | techniques: gravitational microlensing, techniques: high resolution spectra, techniques: high angular resolution, stars: atmosphere models, stars: individual: OGLE 2002-BLG-069 | |
| DOI: | 10.1051/0004-6361:20040112 | |
| Abstract | ||
| We discuss high-resolution, time-resolved spectra of the caustic exit of the binary microlensing event OGLE 2002-BLG-069 obtained with UVES on the VLT. The source star is a G5III giant in the Galactic Bulge. During such events, the source star is highly magnified, and a strong differential magnification around the caustic resolves its surface. Using an appropriate model stellar atmosphere generated by the PHOENIX v2.6 code we obtain a model light curve for the caustic exit and compare it with a dense set of photometric observations obtained by the PLANET microlensing follow up network. We further compare predicted variations in the Halpha equivalent width with those measured from our spectra. While the model and observations agree in the gross features, there are discrepancies suggesting shortcomings in the model, particularly for the Halpha line core, where we have detected amplified emission from the stellar chromosphere after the source star's trailing limb exited the caustic. This achievement became possible by the provision of the very efficient OGLE-III Early Warning System, a network of small telescopes capable of nearly-continuous round-the-clock photometric monitoring, on-line data reduction, daily near-real-time modelling in order to predict caustic crossing parameters, and a fast and efficient response of a 8 m class telescope to a 'Target-of-Opportunity' observation request. | ||
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| Title: | High-Precision Limb-Darkening Measurement of a K3 Giant Using Microlensing | |
| Authors: | Fields, Dale L.; Albrow, M. D.; An, J.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Jörgensen, U. G.; Kane, S.; Martin, R.; Menzies, J.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; Glicenstein, J.-F.; Hauschildt, P. H. | |
| Journal: | The Astrophysical Journal, Volume 596, Issue 2, pp. 1305-1319. | |
| Publication Date: | 10/2003 | |
| Keywords: | Cosmology: Gravitational Lensing, Stars: Atmospheres | |
| Keywords: | gravitational lensing, stars: atmospheres, stars: | |
| DOI: | 10.1086/378196 | |
| Abstract | ||
| We obtain high-precision limb-darkening measurements in five bands (V, VE, IE, I, and H) for the K3 III (Teff=4200 K, [Fe/H]=+0.3, logg=2.3) source of the Galactic bulge microlensing event EROS BLG-2000-5. These measurements are inconsistent with the predictions of atmospheric models at higher than 10 sigma. While the disagreement is present in all bands, it is most apparent in I, IE, and VE, in part because the data are better and in part because the intrinsic disagreement is stronger. We find that when limb-darkening profiles are normalized to have unit total flux, the I-band models for a broad range of temperatures all cross each other at a common point. The solar profile also passes through this point. However, the profile as measured by microlensing does not. We hypothesize that the models have incorporated some aspect of solar physics that is not shared by giant atmospheres. | ||
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| Title: | Constraining the Evolution of ZZ Ceti | |
| Authors: | Mukadam, Anjum S.; Kepler, S. O.; Winget, D. E.; Nather, R. E.; Kilic, M.; Mullally, F.; von Hippel, T.; Kleinman, S. J.; Nitta, A.; Guzik, J. A.; Bradley, P. A.; Matthews, J.; Sekiguchi, K.; Sullivan, D. J.; Sullivan, T.; Shobbrook, R. R.; Birch, P.; Jiang, X. J.; Xu, D. W.; Joshi, S.; Ashoka, B. N.; Ibbetson, P.; Leibowitz, E.; Ofek, E. O.; Meistas, E. G.; Janulis, R.; Alisauskas, D.; Kalytis, R.; Handler, G.; Kilkenny, D.; O'Donoghue, D.; Kurtz, D. W.; Müller, M.; Moskalik, P.; Ogloza, W.; Zola, S.; Krzesinski, J.; Johannessen, F.; Gonzalez-Perez, J. M.; Solheim, J.-E.; Silvotti, R.; Bernabei, S.; Vauclair, G.; Dolez, N.; Fu, J. N.; Chevreton, M.; Manteiga, M.; Suárez, O.; Ulla, A.; Cunha, M. S.; Metcalfe, T. S.; Kanaan, A.; Fraga, L.; Costa, A. F. M.; Giovannini, O.; Fontaine, G.; Bergeron, P.; O'Brien, M. S.; Sanwal, D.; Wood, M. A.; Ahrens, T. J.; Silvestri, N.; Klumpe, E. W.; Kawaler, S. D.; Riddle, R.; Reed, M. D.; Watson, T. K. | |
| Journal: | The Astrophysical Journal, Volume 594, Issue 2, pp. 961-970. | |
| Publication Date: | 09/2003 | |
| Keywords | Stars: Evolution, stars: individual (ZZ Ceti, R548), Stars: Oscillations, Stars: Variables: Other, Stars: White Dwarfs | |
| DOI: | 10.1086/377044 | |
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| Title: | Amplitude and frequency variability of the pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 observed with the Whole Earth Telescope | |
| Authors: | Handler, G.; O'Donoghue, D.; Müller, M.; Solheim, J.-E.; Gonzalez-Perez, J. M.; Johannessen, F.; Paparo, M.; Szeidl, B.; Viraghalmy, G.; Silvotti, R.; Vauclair, G.; Dolez, N.; Pallier, E.; Chevreton, M.; Kurtz, D. W.; Bromage, G. E.; Cunha, M. S.; Østensen, R.; Fraga, L.; Kanaan, A.; Amorim, A.; Giovannini, O.; Kepler, S. O.; da Costa, A. F. M.; Anderson, R. F.; Wood, M. A.; Silvestri, N.; Klumpe, E. W.; Carlton, R. F.; Miller, R. H.; McFarland, J. P.; Grauer, A. D.; Kawaler, S. D.; Riddle, R. L.; Reed, M. D.; Nather, R. E.; Winget, D. E.; Hill, J. A.; SMetcalfe, T. S.; Mukadam, A. S.; Kilic, M.; Watson, T. K.; Kleinman, S. J.; Nitta, A.; Guzik, J. A.; Bradley, P. A.; Sekiguchi, K.; Sullivan, D. J.; Sullivan, T.; Shobbrook, R. R.; Jiang, X.; Birch, P. V.; Ashoka, B. N.; Seetha, S.; Girish, V.; Joshi, S.; Dorokhova, T. N.; Dorokhov, N. I.; Akan, M. C.; Meistas, E. G.; Janulis, R.; Kalytis, R.; Alisauskas, D.; Anguma, S. K.; Kalebwe, P. C.; Moskalik, P.; Ogloza, W.; Stachowski, G.; Pajdosz, G.; Zola, S. | |
| Journal: | Monthly Notice of the Royal Astronomical Society, Volume 340, Issue 3, pp. 1031-1038. | |
| Publication Date: | 04/2003 | |
| Keywords: | stars: individual: KUV 05134+2605, stars: individual: PG 1654+160, stars: oscillations, stars: variables: other. | |
| DOI: | 10.1046/j.1365-8711.2003.06373.x | |
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| Title: | High Precision with the Whole Earth Telescope: Lessons and Some Results from XCov20 for the roAp Star HR 1217 | |
| Authors: | K Kurtz, D. W.; Kawaler, S. D.; Riddle, R. L.; Reed, M. D.; Cunha, M. S.; Wood, M.; Silvestri, N.; Watson, T. K.; Dolez, N.; Moskalik, P.; Zola, S.; Pallier, E.; Guzik, J. A.; Metcalfe, T. S.; Mukadam, A.; Nather, R. E.; Winget, D. E.; Sullivan, D. J.; Sullivan, T.; Sekiguchi, K.; Jiang, X. J.; Shobbrook, R. R.; Birch, P. V.; Ashoka, B. N.; Seetha, S.; Joshi, S.; Girish, V.; O'Donoghue, D.; Handler, G.; Mueller, M.; Gonzalez Perez, J. M.; Solheim, J.-E.; Johannessen, F.; Ulla, A.; Kepler, S. O.; Kanaan, A.; da Costa, A.; Fraga, L.; Giovannini, O.; Matthews, J. M.; Cameron, C.; Vauclair, G.; Nitta, A.; Kleinman, S. J. | |
| Journal: | Baltic Astronomy, v.12, p.105-117. | |
| Publication Date: | 00/2003 | |
| Keywords: | stars: roAp stars, stars: individual: HR 1217 | |
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| Title: | Constraining the Evolution of ZZ Ceti | |
| Authors: | Mukadam, A. S.; Kepler, S. O.; Winget, D. E.; Nather, R. E.; Kilic, M.; Mullally, F.; von Hippel, T.; Kleinman, S. J.; Nitta, A.; Guzik, J. A.; Bradley, P. A.; Matthews, J.; Sekiguchi, K.; Sullivan, D. J.; Sullivan, T.; Shobbrook, R. R.; Birch, P.; Jiang, X. J.; Xu, D. W.; Joshi, S.; Ashoka, B. N.; Ibbetson, P.; Leibowitz, E.; Ofek, E. O.; Meistas, E. G.; Janulis, R.; Alisauskas, D.; Kalytis, R.; Handler, G.; Kilkenny, D.; O O'Donoghue, D.; Kurtz, D. W.; Müller, M.; Moskalik, P.; Ogoza, W.; Zoa, S.; Krzesinski, J.; Johannessen, F.; Gonzalez-Perez, J. M.; Solheim, J.-E.; Silvotti, R.; Bernabei, S.; Vauclair, G.; Dolez, N.; Fu, J. N.; Chevreton, M.; Manteiga, M.; Suárez, O.; Ulla, A.; Cunha, M. S.; Metcalfe, T. S.; Kanaan, A.; Fraga, L.; Costa, A. F. M.; Giovannini, O.; Fontaine, G.; Bergeron, P.; O'Brien, M. S.; Sanwal, D.; Wood, M. A.; Ahrens, T. J.; Silvestri, N.; Klumpe, E. W.; Kawaler, S. D.; Riddle, R.; Reed, M. D.; Watson, T. K. | |
| Journal: | Baltic Astronomy, v.12, p.71-103. | |
| Publication Date: | 00/2003 | |
| Keywords: | stars: white dwarfs: individual: ZZ Cet, R 548, stars: pulsations, evolution | |
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| Title: | Optical Observations and Orbital Parameters of the Close DA plus dMe Binaries BPM 71214, EUVE J0720-31.7, BPM 6502, and EC 13471-1258 | |
| Authors: | Kawka, Adela; Vennes, Stéphane; Koch, Rolf; Williams, Andrew | |
| Journal: | The Astronomical Journal, Volume 124, Issue 5, pp. 2853-2867. | |
| Publication Date: | 11/2002 | |
| Keywords: | Stars: Binaries: Close, stars: individual (BPM 71214), stars: individual (EUVE J0720-31.7), Stars: Individual: Alphanumeric: BPM 6502, stars: individual (EC 13471-1258), Stars: White Dwarfs | |
| DOI: | 10.1086/343836 | |
| Abstract | ||
| We have obtained photometric and spectroscopic observations of the close DA plus dMe binaries BPM 6502 and EC 13471-1258, and spectroscopic observations of the close binaries BPM 71214 and EUVE J0720-31.7. We have updated the ephemerides of BPM 6502 and EUVE J0720-31.7 with the spectroscopic measurements and obtained periods of 0.20162 and 0.15074 days for BPM 71214 and EC 13471-1258, respectively, by measuring the shift in Halpha emission. Photometric variations in R and I due to reprocessing of incoming radiation from the hot white dwarf were observed in BPM 6502. We have also observed eclipses and ellipsoidal variations in B and R for EC 13471-1258, suggesting that the secondary is nearly filling its Roche lobe. | ||
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| Title: | A Short, Nonplanetary, Microlensing Anomaly: Observations and Light-Curve Analysis of MACHO 99-BLG-47 | |
| Authors: | Albrow, M. D.; An, J.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 572, Issue 2, pp. 1031-1040. | |
| Publication Date: | 06/2002 | |
| Keywords: | Stars: Binaries: General, Cosmology: Gravitational Lensing, Stars: Planetary Systems | |
| DOI: | 10.1086/340310 | |
| Abstract | ||
| We analyze PLANET and MACHO observations of MACHO 99-BLG-47, the first nearly normal microlensing event for which high signal-to-noise ratio data reveal a well-covered, short-duration anomaly. This anomaly occurs near the peak of the event. Short-duration anomalies near the peak of otherwise normal events are expected to arise both from extreme-separation (either very close or very wide), roughly equal-mass binary lenses and from planetary systems. We show that the lens of MACHO 99-BLG-47 is in fact an extreme-separation binary, not a planetary system, thus demonstrating for the first time that these two important classes of events can be distinguished in practice. However, we find that the wide-binary and close-binary lens solutions fit the data equally well and cannot be distinguished even at Deltachi2=1. This degeneracy is qualitatively much more severe than the one identified for MACHO 98-SMC-1 because the present degeneracy spans two rather than one dimension in the magnification field and does not require significantly different blending fractions. In the Appendix, we explore this result and show that it is related to the symmetry in the lens equation. | ||
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| Title: | First Microlens Mass Measurement: PLANET Photometry of EROS BLG-2000-5 | |
| Authors: | An, Jin H.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 572, Issue 1, pp. 521-539. | |
| Publication Date: | 06/2002 | |
| Keywords: | Stars: Binaries: General, Cosmology: Gravitational Lensing, Stars: Fundamental Parameters | |
| DOI: | 10.1086/340191 | |
| Abstract | ||
| We analyze PLANET photometric observations of the caustic-crossing binary lens microlensing event, EROS BLG-2000-5, and find that modeling the observed light curve requires incorporation of the microlens parallax and the binary orbital motion. The projected Einstein radius (rE=3.61±0.11 AU) is derived from the measurement of the microlens parallax, and we are also able to infer the angular Einstein radius (thetaE=1.38±0.12 mas) from the finite source effect on the light curve, combined with an estimate of the angular size of the source given by the source position in a color-magnitude diagram. The lens mass, M=0.612±0.057 Msolar, is found by combining these two quantities. This is the first time that parallax effects are detected for a caustic-crossing event and also the first time that the lens mass degeneracy has been completely broken through photometric monitoring alone. The combination of rE and thetaE also allows us to conclude that the lens lies in the near side of the disk, within 2.6 kpc of the Sun, while the radial velocity measurement indicates that the source is a Galactic bulge giant. | ||
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| Title: | Photometry and Imaging of Comet C/2000 WM1 (Linear) | |
| Authors: | Schleicher, David G.; Woodney, Laura M.; Birch, Peter V. | |
| Journal: | Earth, Moon, and Planets, v. 90, Issue 1, p. 401-403 (2002). | |
| Publication Date: | 03/2002 | |
| Keywords: | C/2000 WM1, C/LINEAR (2001 WM1), comet, imaging, narrowband photometry | |
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| Title: | Microlensing Constraints on the Frequency of Jupiter-Mass Companions: Analysis of 5 Years of PLANET Photometry | |
| Authors: | Gaudi, B. S.; Albrow, M. D.; An, J.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Vreeswijk, P. M.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 566, Issue 1, pp. 463-499. | |
| Publication Date: | 02/2002 | |
| Keywords: | Cosmology: Gravitational Lensing, Stars: Planetary Systems, Stars: Low-Mass, Brown Dwarfs | |
| DOI: | 10.1086/337987 | |
| Abstract | ||
| We analyze 5 years of PLANET photometry of microlensing events toward the Galactic bulge to search for the short-duration deviations from single-lens light curves that are indicative of the presence of planetary companions to the primary microlenses. Using strict event-selection criteria, we construct a well-defined sample of 43 intensively monitored events. We search for planetary perturbations in these events over a densely sampled region of parameter space spanning two decades in mass ratio and projected separation, but find no viable planetary candidates. By combining the detection efficiencies of the events, we find that, at 95% confidence, less than 25% of our primary lenses have companions with mass ratio q=10-2 and separations in the lensing zone, [0.6-1.6]thetaE, where thetaE is the Einstein ring radius. Using a model of the mass, velocity, and spatial distribution of bulge lenses, we infer that the majority of our lenses are likely M dwarfs in the Galactic bulge. We conclude that less than 33% of M dwarfs in the Galactic bulge have companions with mass mp=MJ between 1.5 and 4 AU, and less than 45% have companions with mp=3MJ between 1 and 7 AU, the first significant limits on planetary companions to M dwarfs. We consider the effects of the finite size of the source stars and changing our detection criterion, but find that these do not alter our conclusions substantially. | ||
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| Title: | A Search for the Potentially Hazardous Asteroid 1998 OX4: Implications for a Possible Close Encounter in 2014 | |
| Authors: | Biggs, James D.; Slivkoff, Matthew | |
| Journal: | Publications of the Astronomical Society of Australia, Volume 19, Issue 4, pp. 422-424. | |
| Publication Date: | 00/2002 | |
| Keywords: | asteroids: impacts, orbit, 1998 OX4 | |
| DOI: | 10.1071/AS02002 | |
| Abstract | ||
| Small bodies of 100-500m diameter can cause significant damage on impact with the Earth. Such objects are difficult to detect and track because they are intrinsically faint over most of their orbit. We failed to detect one such lost and potentially hazardous minor planet, 1998 OX4, during two observing sessions in 2001, January. The positions searched were those calculated by Milani et al. (2000) with their Virtual Impactors method. Using some simple assumptions we estimate the probability that we failed to detect 1998 OX4 due to it being obscured by objects in the field of our observations is <2×10-7. If the assumptions in the Virtual Impactor model are valid we conclude that an impact with 1998 OX4 is unlikely in 2014, January. Furthermore, given the relatively large area we searched it is also unlikely that this minor planet will have a very close encounter with Earth in 2014. | ||
| Full text available - email J Biggs | ^ Top ^ |
| Title: | Limits on the Abundance of Galactic Planets From 5 Years of PLANET Observations | |
| Authors: | Albrow, M. D.; An, J.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Vreeswijk, P. M.; Watson, R; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 556, Issue 2, pp. L113-L116. | |
| Publication Date: | 08/2001 | |
| Keywords: | Cosmology: Gravitational Lensing, Stars: Planetary Systems, Stars: Late-Type, Stars: Low-Mass, Brown Dwarfs, Techniques: Photometric | |
| DOI: | 10.1086/323141 | |
| Abstract | ||
| We search for signatures of planets in 43 intensively monitored microlensing events that were observed between 1995 and 1999. Planets would be expected to cause a short-duration (~1 day) deviation on the smooth, symmetric light curve produced by a single lens. We find no such anomalies and infer that less than one-third of the ~0.3 Msolar stars that typically comprise the lens population have Jupiter mass companions with semimajor axes in the range of 1.5 AU< a< 4 AU. Since orbital periods of planets at these radii are 3-15 yr, the outer portion of this region is currently difficult to probe with any other technique. | ||
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| Title: | Imaging and Photometry of Comet C/1999 S4 (LINEAR) Before Perihelion and After Breakup | |
| Authors: | Farnham, Tony L.; Schleicher, David G.; Woodney, Laura M.; Birch, Peter V.; Eberhardy, Clara A.; Levy, Lorenza | |
| Journal: | Science, Volume 292, Issue 5520, pp. 1348-1354 (2001). | |
| Publication Date: | 05/2001 | |
| DOI: | 10.1126/science.1058886 | |
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| Title: | Halpha Equivalent Width Variations across the Face of a Microlensed K Giant in the Galactic Bulge | |
| Authors: | Albrow, M.; An, J.; Beaulieu, J.-P.; Caldwell, J. A. R.; Dominik, M.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; Hauschildt, P. H. | |
| Journal: | The Astrophysical Journal, Volume 550, Issue 2, pp. L173-L177. | |
| Publication Date: | 04/2001 | |
| Keywords: | Cosmology: Gravitational Lensing, Stars: Atmospheres, Stars: Fundamental Parameters, stars: individual (EROS 2000-BLG-5) | |
| DOI: | 10.1086/319635 | |
| Abstract | ||
| We present Very Large Telescope FORS1 spectroscopy that temporally resolves the second caustic crossing of the Galactic bulge K giant source of microlensing event EROS 2000-BLG-5, the first time this has been accomplished for several phases of a caustic transit. The ~1 Å Halpha equivalent width of the source star increases slightly as the center of the star egresses the caustic and then plummets by 30% during the final limb crossing. These changes are not seen in contemporaneous spectra of control stars in the FORS1 slit but are qualitatively consistent with expectations from stellar atmosphere models as the caustic differentially magnifies different portions of the stellar face of the target. Observations such as these in a variety of stellar lines are equivalent to atmospheric tomography and are expected to provide a direct test of stellar models. | ||
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| Title: | PLANET Observations of Microlensing Event OGLE-1999-BUL-23: Limb-darkening Measurement of the Source Star | |
| Authors: | Albrow, M. D.; An, J.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 549, Issue 2, pp. 759-769. | |
| Publication Date: | 03/2001 | |
| Keywords: | Stars: Binaries: General, Cosmology: Gravitational Lensing, Stars: Atmospheres, Stars: Fundamental Parameters | |
| DOI: | 10.1086/319437 | |
| Abstract | ||
| We present PLANET observations of OGLE-1999-BUL-23, a binary-lens microlensing event toward the Galactic bulge. PLANET observations in the I and V bands cover the event from just before the first caustic crossing until the end of the event. In particular, a densely sampled second caustic crossing enables us to derive the linear limb-darkening coefficients of the source star: cV=0.786+0.080-0.078 and cI=0.632+0.047-0.037. Combined analysis of the light curve and the color-magnitude diagram suggests that the source star is a G/K subgiant in the Galactic bulge (Teff~=4800 K). The resulting linear limb-darkening coefficient of the source is consistent with theoretical predictions, although it is likely that nonlinearity of the stellar surface brightness profile complicates the interpretation, especially for the I band. The global light curve fit to the data indicates that the event is due to a binary lens of a mass ratio q~=0.39 and a projected separation d~=2.42. The lens/source relative proper motion is (22.8±1.5) km s-1 kpc-1, typical of bulge/bulge or bulge/disk events. | ||
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| Title: | Delta Scuti Network observations of XX Pyx: detection of 22 pulsation modes and of short-term amplitude and frequency variations | |
| Authors: | Handler, G.; Arentoft, T.; Shobbrook, R. R.; Wood, M. A.; Crause, L. A.; Crake, P.; Podmore, F.; Habanyama, A.; Oswalt, T.; Birch, P. V.; Lowe, G.; Sterken, C.; Meintjes, P.; Brink, J.; Claver, C. F.; Medupe, R.; Guzik, J. A.; Beach, T. E.; Martinez, P.; Leibowitz, E. M.; Ibbetson, P. A.; Smith, T.; Ashoka, B. N.; Raj, N. E.; Kurtz, D. W.; Balona, L. A.; O'Donoghue, D.; Costa, J. E. S.; Breger, M. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 2, pp. 511-525. | |
| Publication Date: | 10/2000 | |
| Keywords: | TECHNIQUES: PHOTOMETRIC, STARS: INDIVIDUAL: CD-24 7599, STARS: INDIVIDUAL: XX PYX, STARS: OSCILLATIONS, &DELTA; SCUTI | |
| ^ Top ^ |
| Title: | Discovery of the Optical Counterpart and Early Optical Observations of GRB 990712 | |
| Authors: | Sahu, K. C.; Vreeswijk, P.; Bakos, G.; Menzies, J. W.; Bragaglia, A.; Frontera, F.; Piro, L.; Albrow, M. D.; Bond, I. A.; Bower, R.; Caldwell, J. A. R.; Castro-Tirado, A. J.; Courbin, F.; Dominik, M.; Fynbo, J. U.; Galama, T.; Glazebrook, K.; Greenhill, J.; Gorosabel, J.; Hearnshaw, J.; Hill, K.; Hjorth, J.; Kane, S.; Kilmartin, P. M.; Kouveliotou, C.; Martin, R.; Masetti, N.; Maxted, P.; Minniti, D.; Müller, P.; Muraki, Y.; Nakamura, T.; Noda, S.; Ohnishi, K.; Palazzi, E.; van Paradijs, J.; Pian, E.; Pollard, K. R.; Rattenbury, N. J.; Reid, M.; Rol, E.; Saito, T.; Sackett, P. D.; Saizar, P.; Tinney, C.; Vermaak, P.; Watson, R.; Williams, A.; Yock, P.; Dar, A. | |
| Journal: | The Astrophysical Journal, Volume 540, Issue 1, pp. 74-80. | |
| Publication Date: | 09/2000 | |
| Keywords: | Cosmology: Observations, Gamma Rays: Bursts | |
| DOI: | 10.1086/309340 | |
| Abstract | ||
| We present the discovery observations of the optical counterpart of the gamma-ray burst GRB 990712 taken 4.16 hr after the outburst and discuss its light curve observed in the V, R, and I bands during the first ~35 days after the outburst. The observed light curves were fitted with a power-law decay for the optical transient (OT), plus an additional component that was treated in two different ways. First, the additional component was assumed to be an underlying galaxy of constant brightness. The resulting slope of the decay is 0.97+0.05-0.02, and the magnitudes of the underlying galaxy are V=22.3±0.05, R=21.75±0.05, and I=21.35±0.05. Second, the additional component was assumed to be a galaxy plus an underlying supernova with a time-variable brightness identical to that of GRB 980425, appropriately scaled to the redshift of GRB 990712. The resulting slope of the decay is similar, but the goodness of fit is worse, which would imply that either this GRB is not associated with an underlying supernova or the underlying supernova is much fainter than the supernova associated with GRB 980425. The galaxy in this case is fainter: V=22.7±0.05, R=22.25±0.05, and I=22.15±0.05, and the OT plus the underlying supernova at a given time is brighter. Measurements of the brightnesses of the OT and the galaxy by late-time Hubble Space Telescope observation and ground-based observations can thus assess the presence of an underlying supernova. Based on observations collected at SAAO, Sutherland; ESO, Paranal and La Silla (ESO Programs 63.O-0618 and 63-O-0567) and AAT, Australia. | ||
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| Title: | Limits on Stellar and Planetary Companions in Microlensing Event OGLE-1998-BUL-14 | |
| Authors: | Gaudi, B. S.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 535, Issue 1, pp. 176-189. | |
| Publication Date: | 05/2000 | |
| Keywords: | Cosmology: Dark Matter, Cosmology: Gravitational Lensing, Stars: Planetary Systems | |
| DOI: | 10.1086/308842 | |
| Abstract | ||
| We present the PLANET photometric data set for OGLE-1998-BUL-14, a high-magnification (Amax~16) event alerted by the OGLE collaboration toward the Galactic bulge in 1998. The PLANET data set consists a total of 461 I-band and 139 V-band points, the majority of which was taken over a 3 month period. The median sampling interval during this period is about 1 hr, and the 1 sigma scatter over the peak of the event is 1.5%. The excellent data quality and high maximum magnification of this event make it a prime candidate to search for the short-duration, low-amplitude perturbations that are signatures of a planetary companion orbiting the primary lens. The observed light curve for OGLE-1998-BUL-14 is consistent with a single lens (no companion) within photometric uncertainties. We calculate the detection efficiency of the light curve to lensing companions as a function of the mass ratio and angular separation of the two components. We find that companions of mass ratio > =0.01 are ruled out at the 95% significance level for projected separations between 0.4 and 2.4rE, where rE is the Einstein ring radius of the primary lens. Assuming that the primary is a G dwarf with rE~3 AU, our detection efficiency for this event is ~60% for a companion with the mass and separation of Jupiter and ~5% for a companion with the mass and separation of Saturn. Our efficiencies for planets like those around upsilo And and 14 Her are > 75%. | ||
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| Title: | Detection of Rotation in a Binary Microlens: PLANET Photometry of MACHO 97-BLG-41 | |
| Authors: | Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; Bond, H. E.; van Bemmel, I. M. | |
| Journal: | The Astrophysical Journal, Volume 534, Issue 2, pp. 894-906. | |
| Publication Date: | 05/2000 | |
| Keywords: | Stars: Binaries: General, Cosmology: Gravitational Lensing, Stars: Planetary Systems | |
| DOI: | 10.1086/308798 | |
| Abstract | ||
| We analyze PLANET collaboration data for MACHO 97-BLG-41, the only microlensing event observed to date in which the source transits two disjoint caustics. The PLANET data, consisting of 46 V-band and 325 I-band observations from five southern observatories, span a period from the initial alert until the end of the event. Our data are incompatible with a static binary lens, but are well fitted by a rotating binary lens of mass ratio q=0.34 and angular separation d~0.5 (in units of the Einstein ring radius), in which the binary separation changes in size by deltad=-0.070±0.009 and in orientation by deltatheta=5.61d±0.36d during the 35.17 days between the separate caustic transits. We use this measurement, combined with other observational constraints, to derive the first kinematic estimate of the mass, distance, and period of a binary microlens. The relative probability distributions for these parameters peak at a total lens mass M~0.3 Msolar (M-dwarf binary system), lens distance DL~5.5 kpc, and binary period P~1.5 yr. The robustness of our model is demonstrated by its striking agreement with MACHO/GMAN data that cover several sharp features in the light curve not probed by the PLANET observations, and which did not enter our modeling procedure in any way. Available data sets thus indicate that the light curve of MACHO 97-BLG-41 can be modeled as a source crossing two caustics of a physically realistic rotating binary. Thus, contrary to a recent suggestion, the additional effects of a postulated planetary companion to the binary lens are not required. Based on observations at Canopus Observatory, Tasmania, Australia; Perth Observatory, Bickley, Australia; the South African Astronomical Observatory, Sutherland, South Africa; the European Southern Observatory, La Silla, Chile; and the Cerro Tololo Inter-American Observatory, Cerro Tololo, Chile. | ||
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| Title: | Combined Analysis of the Binary Lens Caustic-crossing Event MACHO 98-SMC-1 | |
| Authors: | fonso, C; ; Alard, C.; Albert, J. N.; Andersen, J.; Ansari, R.; Aubourg, É Bareyre, P.; Bauer, F.; Beaulieu, J. P.; Bouquet, A.; Char, S.; Charlot, X.; Couchot, F.; Coutures, C.; Derue, F.; Ferlet, R.; Glicenstein, J. F.; Goldman, B.; Gould, A.; Graff, D.; Gros, M.; Haissinski, J.; Hamilton, J. C.; Hardin, D.; de Kat, J.; Kim, A.; Lasserre, T.; Lesquoy, É .; Loup, C.; Magneville, C.; Marquette, J. B.; Maurice, É Milsztajn, A.; Moniez, M.; Palanque-Delabrouille, N.; Perdereau, O.; Pré vot, L.; Regnault, N.; Rich, J.; Spiro, M.; Vidal-Madjar, A.; Vigroux, L.; Zylberajch, S.; Alcock, C.; Allsman, R. A.; Alves, D.; Axelrod, T. S.; Becker, A. C.; Cook, K. H.; Drake, A. J.; Freeman, K. C.; Griest, K.; King, L. J.; Lehner, M. J.; Marshall, S. L.; Minniti, D.; Peterson, B. A.; Pratt, M. R.; Quinn, P. J.; Rodgers, A. W.; Stetson, P. B.; Stubbs, C. W.; Sutherland, W.; Tomaney, A.; Vandehei, T.; Rhie, S. H.; Bennett, D. P.; Fragile, P. C.; Johnson, B. R.; Quinn, J.; Udalski, A.; Kubiak, M.; Szymanski, M.; Pietrzynski, G.; Wozniak, P.; Zebrun, K.; Albrow, M. D.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gaudi, B. S.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | The Astrophysical Journal, Volume 532, Issue 1, pp. 340-352. | |
| Publication Date: | 03/2000 | |
| Keywords: | ASTROMETRY, COSMOLOGY: DARK MATTER, COSMOLOGY: GRAVITATIONAL LENSING, GALAXIES: MAGELLANIC CLOUDS | |
| DOI: | 10.1086/308561 | |
| Abstract | ||
| We fit the data for the binary lens microlensing event MACHO 98-SMC-1 from five different microlensing collaborations and find two distinct solutions characterized by binary separation d and mass ratio q: (d,q)=(0.54,0.50) and (d,q)=(3.65,0.36), where d is in units of the Einstein radius. However, the relative proper motion of the lens is very similar in the two solutions, 1.30 km s-1 kpc-1 and 1.48 km s-1 kpc-1, thus confirming that the lens is in the Small Magellanic Cloud. The close binary can be either rotating or approximately static but the wide binary must be rotating at close to its maximum allowed rate to be consistent with all the data. We measure limb-darkening coefficients for five bands ranging from I to V. As expected, these progressively decrease with rising wavelength. This is the first measurement of limb darkening for a metal-poor A star. | ||
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| Title: | Time-series photometry of the delta Scuti star XX Pyx. A. Introduction and Overview | |
| Authors: | Handler, G.; Arentoft, T.; Shobbrook, R. R.; Sullivan, D. J.; Kleinman, S. J.; Clemens, J. C.; O'Donoghue, D.; Wood, M. A.; Crake, P.; Buckley, D. A. H.; Zima, W.; Kanaan, A.; Crause, L. A.; van der Peet, A. J.; Podmore, F.; Habanyama, A.; Oswalt, T.; Lowe, G.; Claver, C. F.; Chen, A.-L.; Birch, P. V.; Sterken, C.; Meintjes, P.; Brink, J.; Medupe, R.; Guzik, J. A.; Beach, T. E.; Martinez, P.; Audard, N.; Leibowitz, E. M.; Ibbetson, P. A.; Krisciunas, K.; Nitta, A.; Smith, T.; Giovannini, O.; Raj, N. E.; Ashoka, B. N.; Kurtz, D. W.; Watson, T. K.; O'Brien, M. S. | |
| Journal: | The Journal of Astronomical Data (JAD), Volume 6, Number 4A, 2000. | |
| Publication Date: | 00/2000 | |
| ^ Top ^ |
| Title: | Time-series photometry of the delta Scuti star XX Pyx F. Photoelectric observations from the Perth and Vainu Bappu Observatories | |
| Authors: | Birch, P.; Crake, P.; Lowe, G.; Smith, T.; Ashoka, B.; Raj, N.; Handler, G. | |
| Journal: | The Journal of Astronomical Data (JAD), Volume 6, Number 4F, 2000. | |
| Publication Date: | 00/2000 | |
| ^ Top ^ |
| Title: | A Complete Set of Solutions for Caustic Crossing Binary Microlensing Events | |
| Authors: | Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Depoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; | |
| Journal: | The Astrophysical Journal, Volume 522, Issue 2, pp. 1022-1036. | |
| Publication Date: | 09/1999 | |
| Keywords: | ASTROMETRY, COSMOLOGY: DARK MATTER, COSMOLOGY: GRAVITATIONAL LENSING | |
| DOI: | 10.1086/307699 | |
| Abstract | ||
| We present a method to analyze binary lens microlensing light curves with one well-sampled fold caustic crossing. In general, the surface of chi^2 shows extremely complicated behavior over the nine-parameter space that characterizes binary lenses. This makes it difficult to systematically search the space and verify that a given local minimum is a global minimum. We show that for events with well-monitored caustics, the caustic crossing region can be isolated from the rest of the light curve and easily fitted to a five-parameter function. Four of these caustic crossing parameters can then be used to constrain the search in the larger nine-parameter space. This allows a systematic search for all solutions and thus identification of all local minima. We illustrate this technique using the PLANET data for MACHO 98-SMC-1, an excellent and publicly available caustic crossing data set. We show that a very broad range of parameter combinations are compatible with the PLANET data set, demonstrating that observations of binary lens light curves with a sampling of only one caustic crossing do not yield unique solutions. The corollary to this is that the time of the second caustic crossing cannot be reliably predicted on the basis of early data including the first caustic crossing alone. We investigate the requirements for determination of a unique solution and find that occasional observations of the first caustic crossing may be sufficient to derive a complete solution. | ||
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| Title: | Limb Darkening of a K Giant in the Galactic Bulge: PLANET Photometry of MACHO 97-BLG-28 | |
| Authors: | Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Dominik, M.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; Sahu, M. S. | |
| Journal: | The Astrophysical Journal, Volume 522, Issue 2, pp. 1011-1021. | |
| Publication Date: | 09/1999 | |
| Keywords: | STARS: BINARIES: VISUAL, COSMOLOGY: GRAVITATIONAL LENSING, STARS: FUNDAMENTAL PARAMETERS, STARS: LATE-TYPE | |
| DOI: | 10.1086/307681 | |
| Abstract | ||
| We present the PLANET photometric data set for the binary-lens microlensing event MACHO 97-BLG-28, consisting of 696 I- and V-band measurements, and analyze it to determine the radial surface brightness profile of the Galactic bulge source star. The microlensed source, demonstrated to be a K giant by our independent spectroscopy, crossed an isolated cusp of the central caustic of the lensing binary, generating a sharp peak in the light curve that was well-resolved by dense (3-30 minute) and continuous monitoring from PLANET sites in Chile, South Africa, and Australia. This is the first time that such a cusp crossing has been observed. Analysis of the PLANET data set has produced a measurement of the square-root limb-darkening coefficients of the source star in the I and V bands; the resulting stellar profiles are in excellent agreement with those predicted by stellar atmospheric models for K giants. The limb-darkening coefficients presented here are the first derived from microlensing. They are also among the first found for normal giants by any technique and the first for any star as distant as the Galactic bulge. Modeling of our light curve for MACHO 97-BLG-28 indicates that the lensing binary has a mass ratio q=0.23 and an (instantaneous) separation in units of the angular Einstein ring radius of d=0.69. For a lens in the Galactic bulge, this corresponds to a typical stellar binary with a projected separation between 1 and 2 AU. If the lens lies closer (i.e., in the Galactic disk), the separation is smaller, and one or both of the lens objects is in the brown dwarf regime. Assuming that the source is a bulge K2 giant at 8 kpc, the relative lens-source proper motion is mu=19.4±2.6 km s^-1 kpc^-1, consistent with a disk or bulge lens. If the nonlensed blended light is due to a single star, it is likely to be a young white dwarf in the bulge, consistent with the blended light coming from the lens itself. | ||
| ^ Top ^ | ||
| Title: | Limb Darkening of a K Giant in the Galactic Bulge: PLANET Photometry of MACHO 97-BLG-28 | |
| Authors: | Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Dominik, M.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; Sahu, M. S. | |
| Journal: | The Astrophysical Journal, Volume 522, Issue 2, pp. 1011-1021. | |
| Publication Date: | 09/1999 | |
| Keywords: | STARS: BINARIES: VISUAL, COSMOLOGY: GRAVITATIONAL LENSING, STARS: FUNDAMENTAL PARAMETERS, STARS: LATE-TYPE | |
| DOI: | 10.1086/307681 | |
| Abstract | ||
| We present the PLANET photometric data set for the binary-lens microlensing event MACHO 97-BLG-28, consisting of 696 I- and V-band measurements, and analyze it to determine the radial surface brightness profile of the Galactic bulge source star. The microlensed source, demonstrated to be a K giant by our independent spectroscopy, crossed an isolated cusp of the central caustic of the lensing binary, generating a sharp peak in the light curve that was well-resolved by dense (3-30 minute) and continuous monitoring from PLANET sites in Chile, South Africa, and Australia. This is the first time that such a cusp crossing has been observed. Analysis of the PLANET data set has produced a measurement of the square-root limb-darkening coefficients of the source star in the I and V bands; the resulting stellar profiles are in excellent agreement with those predicted by stellar atmospheric models for K giants. The limb-darkening coefficients presented here are the first derived from microlensing. They are also among the first found for normal giants by any technique and the first for any star as distant as the Galactic bulge. Modeling of our light curve for MACHO 97-BLG-28 indicates that the lensing binary has a mass ratio q=0.23 and an (instantaneous) separation in units of the angular Einstein ring radius of d=0.69. For a lens in the Galactic bulge, this corresponds to a typical stellar binary with a projected separation between 1 and 2 AU. If the lens lies closer (i.e., in the Galactic disk), the separation is smaller, and one or both of the lens objects is in the brown dwarf regime. Assuming that the source is a bulge K2 giant at 8 kpc, the relative lens-source proper motion is mu=19.4±2.6 km s^-1 kpc^-1, consistent with a disk or bulge lens. If the nonlensed blended light is due to a single star, it is likely to be a young white dwarf in the bulge, consistent with the blended light coming from the lens itself. | ||
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| Title: | The Relative Lens-Source Proper Motion in MACHO 98-SMC-1 | |
| Authors: | Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Depoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; Pogge, R. W. | |
| Journal: | The Astrophysical Journal, Volume 512, Issue 2, pp. 672-677. | |
| Publication Date: | 02/1999 | |
| Keywords: | STARS: BINARIES: VISUAL, GALAXY: HALO, COSMOLOGY: GRAVITATIONAL LENSING, GALAXIES: MAGELLANIC CLOUDS | |
| DOI: | 10.1086/306820 | |
| Abstract | ||
| We present photometric and spectroscopic data for the second microlensing event seen toward the Small Magellanic Cloud (SMC), MACHO 98-SMC-1. The lens is a binary. We resolve the caustic crossing and find that the source took 2Deltat=8.5 hr to transit the caustic. We measure the source temperature T_eff=8000 K both spectroscopically and from the color, (V-I)_0~0.22. We find two acceptable binary-lens models. In the first, the source crosses the caustic at phi=43.2d and the unmagnified source magnitude is I_s=22.15. The angle implies that the lens crosses the source radius in time t_*=Deltatsinphi=2.92 hr. The magnitude (together with the temperature) implies that the angular radius of the source is theta_*=0.089 muas. Hence, the proper motion is mu=theta_*/t_*=1.26 km s^-1 kpc^-1. For the second solution, the corresponding parameters are phi=30.6d, I_s=21.81, t_*=2.15 hr, theta_*=0.104 muas, and mu=theta_*/t_*=2.00 km s^-1 kpc^-1. Both proper-motion estimates are slower than 99.5% of the proper motions expected for halo lenses. Both are consistent with an ordinary binary lens moving at ~75-120 km s^-1 within the SMC itself. We conclude that the lens is most likely in the SMC proper. | ||
| ^ Top ^ | ||
| Title: | The 1995 Pilot Campaign of PLANET: Searching for Microlensing Anomalies through Precise, Rapid, Round-the-Clock Monitoring | |
| Authors: | Albrow, M.; Beaulieu, J.-P.; Birch, P.; Caldwell, J. A. R.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; > Vreeswijk, P.; Williams, A.; Zwaan, M. A.; | |
| Journal: | The Astrophysical Journal, Volume 509, Issue 2, pp. 687-702. | |
| Publication Date: | 12/1998 | |
| Keywords: | GALAXY: STELLAR CONTENT, COSMOLOGY: GRAVITATIONAL LENSING, STARS: PLANETARY SYSTEMS, STARS: VARIABLES: OTHER, SURVEYS | |
| DOI: | 10.1086/306513 | |
| Abstract | ||
| PLANET (the Probing Lensing Anomalies NETwork) is a worldwide collaboration of astronomers whose primary goal is to monitor microlensing events densely and precisely in order to detect and study anomalies that contain information about Galactic lenses and sources that would otherwise be unobtainable. The results of PLANET's highly successful first year of operation are presented here. Details of the observational setup, observing procedures, and data-reduction procedures used to track the progress in real time at the three participating observing sites in 1995 are discussed. The ability to follow several events simultaneously with a median sampling interval of 1.6 hr and a photometric precision of better than 0.10 mag even at I = 19 has been clearly demonstrated. During PLANET's 1995 pilot campaign, ten microlensing events were monitored, resulting in the most precise and densely-sampled light curves to date; the binary nature of one of these, MACHO 95-BLG-12, was recognized by PLANET on the mountain. Another event, OGLE 95-BLG-04, displayed chromaticity that may betray the presence of blending with unresolved stars projected onto the same resolution element. Although lasting only about a month, the campaign may allow constraints to be placed on the number of planets with mass ratios to the parent star of 0.01 or greater. | ||
| ^ Top ^ | ||
| Title: | The 1998 PLANET Gravitational Microlensing Season | |
| Authors: | Depoy, D. L.; Albrow, M. D.; Beaulieu, J. P.; Caldwell, J.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pogge, R.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | American Astronomical Society, 193rd AAS Meeting, #117.01; Bulletin of the American Astronomical Society, Vol. 30, p.1424 | |
| Publication Date: | 12/1998 | |
| Abstract | ||
| The Probing Lensing Anomalies NETwork is an international collaboration that makes coordinated observations of on-going graviational microlensing events from four sites in the southern hemisphere. One of our primary goals is to detect planets around other stars from their microlensing effect. During the 1998 bulge observing season we intensely monitored numerous microlensing events; one event was observed more than 500 times at I and 200 times at V. The frequency and general quality of our photometry gives us excellent sensitivity to second order gravitational microlensing effects (such as those due to the presence of a planet). | ||
| ^ Top ^ | ||
| Title: | Limits on Planetary Companions in Microlensing Event OGLE-BUL-98-14 | |
| Authors: | Gaudi, B. S.; Albrow, M. D.; Beaulieu, J. P.; Caldwell, J. A. R.; Depoy, D. L.; Dominik, M.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pogge, R. W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | American Astronomical Society, 193rd AAS Meeting, #108.07; Bulletin of the American Astronomical Society, Vol. 30, p.1416 | |
| Publication Date: | 12/1998 | |
| Abstract | ||
| As part of an ongoing effort to detect second order effects in gravitational microlensing events, the Probing Lensing Anomalies NETwork (PLANET) collaboration has obtained nearly continuous photometry of the microlensing event OGLE-BUL-98-14 with four telescopes located in Tasmania, Perth, South Africa and Chile. The complete data set consists of over 500 points in I and 200 in V taken over a period of ~ 120 days, making this one of the most well sampled microlensing events to date. The scatter in I is ~ 2% (1 sigma). OGLE-BUL-98-14 was a high magnification event (maximum magnification > 10) with a timescale of ~ 40 days. These facts, combined with the high sampling rate and good photometry, make this an extremely promising event for detection of second order effects. We find that the observed lightcurve is completely consistent with a point-source point-lens model. We can rule out the presence of a companion with mass ratio > 10(-3) over a substantial range of projected separations. Furthermore, the lack of detected finite-source or parallax effects allows us to put a lower limit on the mass of the lens, Mlens > 0.1 Msun. | ||
| ^ Top ^ | ||
| Title: | Light curves of SN 1998A and comparison with similar unusual SNe | |
| Authors: | Woodings, Simon J.; Williams, Andrew J.; Martin, Ralph; Burman, Ronald R.; Blair, David G. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, Volume 301, Issue 1, pp. L5-L9. | |
| Publication Date: | 11/1998 | |
| Keywords: | SUPERNOVAE: GENERAL, SUPERNOVAE: INDIVIDUAL: SN 1998A, SUPERNOVAE: INDIVIDUAL: SN 1987A, SUPERNOVAE: INDIVIDUAL: SN 1909A, SUPERNOVAE: INDIVIDUAL: SN 1993J | |
| Abstract | ||
| Preliminary photometric data for SN 1998A are presented, showing that it increased in brightness by 1.0±0.1 mag in RI over the 80-d period following discovery. Maximum brightness occurred approximately 70 d after discovery, centred within a broad plateau-like peak lasting about 30 d. The shapes of the light curves during the entire 170-d period are similar to those of SNe 1987A and 1909A, suggesting that SNe 1998A and 1909A may also have had blue supergiant progenitors. Spectroscopic and further photometric study of SN 1998A will allow more detailed comparisons between this and other unusual Type II supernovae. | ||
| ^ Top ^ | ||
| Title: | Narrowband Photometry of Comet P/Halley: Variation with Heliocentric Distance, Season, and Solar Phase Angle | |
| Authors: | Schleicher, David G.; Millis, Robert L.; Birch, Peter V. | |
| Journal: | Icarus, Volume 132, Issue 2, pp. 397-417. | |
| Publication Date: | 04/1998 | |
| DOI: | 10.1006/icar.1997.5902 | |
| ^ Top ^ |
| Full text available - email J Biggs | ^ Top ^ |
| Title: | Initial statistics from the Perth Automated Supernova Search | |
| Authors: | Williams, A. J. | |
| Journal: | Publications Astronomical Society of Australia, vol. 14, no. 2, p. 208-13 | |
| Publication Date: | 08/1997 | |
| Keywords: | SUPERNOVAE, STARS, STATISTICS | |
| Abstract | ||
| The Perth Automated Supernova Search uses the 61-cm PLAT (Perth Lowell Automated Telescope) at Perth Observatory, Western Australia. Since 1993 January 1, five confirmed supernovae have been found by the search. The analysis of the first three years of data is discussed, and preliminary results presented. We find a Type Ib/c rate of 0.43 ± 0.43 SNu, and a Type IIP rate of 0.86 ± 0.49 SNu, where SNu are 'supernova units'. These values are for a Hubble constant of 75 km per sec per Mpc. | ||
| ^ Top ^ | ||
| Title: | Variable central stars of young planetary nebulae. I. Photometric multisite observations of IC 418. | |
| Authors: | Handler, G.; Mendez, R. H.; Medupe, R.; Costero, R.; Birch, P. V.; Alvarez, M.; Sullivan, D. J.; Kurtz, D. W.; Herrero, A.; Guerrero, M. A.; Ciardullo, R.; Breger, M. | |
| Journal: | Astronomy and Astrophysics, v.320, p.125-135 | |
| Publication Date: | 04/1997 | |
| Keywords: | STARS: VARIABLES: OTHER, STARS: INDIVIDUAL: HD 35914, PLANETARY NEBULAE: INDIVIDUAL: IC 418, STARS: OSCILLATIONS, STARS: MASS LOSS, TECHNIQUES: PHOTOMETRIC | |
| ^ Top ^ |
| Title: | Observations and elements of the eclipsing binary FO Hydra | |
| Authors: | Candy, M. P.; Candy, B. N. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 1, pp. 229-234. | |
| Publication Date: | 03/1997 | |
| Keywords: | TECHNIQUES: PHOTOMETRIC, BINARIES: ECLIPSING, STARS: FUNDAMENTAL PARAMETERS, STARS: INDIVIDUAL: FO HYDRA | |
| ^ Top ^ |
| Title: | Complex behaviour of the delta Scuti star theta Tucanae. I. Frequencies in the light variation. | |
| Authors: | Paparo, M.; Sterken, C.; Spoon, H. W. W.; Birch, P. V. | |
| Journal: | Astronomy and Astrophysics, v.315, p.400-410 | |
| Publication Date: | 11/1996 | |
| Keywords: | STARS: INDIVIDUAL: {THETA} TUC = HR 139, STARS: OSCILLATIONS, STARS: VARIABLES: {DELTA} SCUTI, INFRARED: STARS, ULTRAVIOLET: STARS, STARS: BINARIES: GENERAL | |
| ^ Top ^ |
| Title: | The ultraviolet polarization of the Crab pulsar | |
| Authors: | Graham-Smith, Dolan, J. F.; Boyd, P. T.; Biggs, J. D.; Lyne, A. G.; Percival, J. W. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 4, pp. 1354-1358. | |
| Publication Date: | 10/1996 | |
| Keywords: | POLARIZATION - PULSARS, INDIVIDUAL, CRAB - ULTRAVIOLET, STARS. | |
| Abstract | ||
| The linear polarization of the Crab pulsar has been observed in the ultraviolet using the High Speed Photometer on the Hubble Space Telescope. The polarization as a function of pulse phase is strikingly similar to that observed in the visible, with the same values of fractional polarization and the same swing of position angle occurring through the main and secondary pulses. The polarization pulse profile must be essentially wavelength-independent at wavelengths shorter than the infrared, as predicted by the geometric model of the emission region proposed by Smith et al. | ||
| Full text available - email J Biggs | ^ Top ^ |
| Title: | The p-mode spectrum of gamma Equ (HR 8097). | |
| Authors: | Martinez, P.; Weiss, W. W.; Nelson, M. J.; Kreidl, T. J.; Roberts, G. R.; Mkrtichian, D. E.; Dorokhov, N. I.; Dorokhova, T. N.; Birch, P. V. | |
| Journal: | Mon. Not. R. Astron. Soc., 282, 243-251 (1996) | |
| Publication Date: | 09/1996 | |
| ^ Top ^ |
| Title: | A Search for Radio Pulsars in Globular Clusters, Supernova Remnants and Transient X-Ray Sources | |
| Authors: | Biggs, J. D.; Lyne, A. G. | |
| Journal: | Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 2, pp. 691-698. | |
| Publication Date: | 09/1996 | |
| Keywords: | SURVEYS - PULSARS, GENERAL - SUPERNOVA REMNANTS - GLOBULAR CLUSTERS, GENERAL - X-RAYS, GENERAL. | |
| Abstract | ||
| We present the results of a targeted search for radio pulsars in globular clusters, supernova remnants (SNRs) and transient X-ray sources. 85 globular clusters, 29 SNRs and three transient X-ray sources were observed in the course of the search, during which four pulsars were found. For each object searched, the sensitivity limit is given. The four new pulsars discovered were all in globular clusters, namely PSR B1620-26 in M4, PSR B1718-19 in NGC6342, and PSR B1820-30A and B1820-30B in NGC6624. While PSR B1620-26 provides strong support for the binary evolution hypothesis for the formation of millisecond pulsars, PSR B1718-19 and B1820-30A are somewhat anomalous as they are apparently relatively young, the former pulsar and PSR B1820-30B have high magnetic fields, and all are located in old globular clusters (ages ~1010yr). Not surprisingly, the well-known pulsar PSR B0531+21 was detected in the Crab nebula SNR. The number of pulsars detected was probably limited by the finite size of pulsar emission beams, as in any survey. Other factors such as large distance, low pulsar luminosity and orbital motion may have inhibited the detection of other pulsars in globular clusters. Pulsars in SNRs and transient X-ray sources are probably less affected by these factors. Our inability to detect the former is probably due to the relatively high level of emission from the SNRs, the limited area that we observed within each target and possibly the high birth velocity of pulsars which carries them away from the centres of their remnants. Processes concerning the accretion discs of transient X-ray sources probably thwarted the detection of any potential radio pulsars in these systems. | ||
| Full text available - email J Biggs | ^ Top ^ |
| Title: | The Polarization of X-Ray Binaries in the Ultraviolet. I. Cygnus XR-1, 4U 0900-40, and 4U 1700-37 | |
| Authors: | Wolinski, Karen G.; Dolan, Joseph F.; Boyd, Patricia T.; Biggs, James D.; Nelson, Matthew J.; Percival, Jeffrey W.; Taylor, M.; van Citters, G. W. | |
| Journal: | Astrophysical Journal v.457, p.859 | |
| Publication Date: | 02/1996 | |
| Keywords: | POLARIZATION, STARS: INDIVIDUAL CONSTELLATION NAME: CYGNUS XR-1, STARS: INDIVIDUAL ALPHANUMERIC: 4U 1700-37, STARS: INDIVIDUAL ALPHANUMERIC: 4U 0900-40, X-RAYS: STARS | |
| DOI: | 10.1086/176781 |
| Full text available - email J Biggs | ^ Top ^ |
| Title: | Models of four asteroids: 17 Thetis, 52 Europa, 532 Herculina, and 704 Interamnia. | |
| Authors: | Michalowski, T.; Velichko, F. P.; di Martino, M.; Krugly, Yu. N.; Kalashnikov, V. G.; Shevchenko, V. G.; Birch, P. V.; Sears, W. D.; Denshev, P.; Kwiatkowski, T. | |
| Journal: | Icarus, vol. 118, p. 292-301 (1995). | |
| Publication Date: | 12/1995 | |
| DOI: | 10.1006/icar.1995.1192 | |
| ^ Top ^ |
| Title: | The ensemble properties of comets: Results from narrowband photometry of 85 comets, 1976-1992. | |
| Authors: | A'Hearn, M. F.; Millis, R. L.; Schleicher, D. G.; Osip, D. J.; Birch, P. V. | |
| Journal: | Icarus, vol. 118, p. 223-270 (1995). | |
| Publication Date: | 12/1995 | |
| DOI: | 10.1006/icar.1995.1190 | |
| ^ Top ^ |
| Title: | The lightcurve of 4179 Toutatis: Evidence for complex rotation. | |
| Authors: | Spencer, J. R.; Akimov, L. A.; Angeli, C.; Angelini, P.; Barucci, M. A.; Birch, P.; Blanco, C.; Buie, M. W.; Caruso, A.; Chiornij, V. G.; Colas, F.; Dentshev, P.; Dorokhov, N. I.; de Sanctis, M. C.; Dotto, E.; Ezhkova, O. B.; Fulchignoni, M.; Green, S.; Harris, A. W.; Howell, E. S.; Hudecek, T.; Kalashnikov, A. V.; Kobelev, V. V.; Korobova, Z. B.; Koshkin, N. I.; Kozhevnikov, V. P.; Krugly, Y. N.; Lazzaro, D.; Lecacheux, J.; MacConnell, J.; Mel'Nikov, S. Y.; Michalowski, T.; Mueller, B. E. A.; Nakamura, T.; Neese, C.; Nolan, M. C.; Osborn, W.; Pravec, P.; Riccioli, D.; Shevchenko, V. S.; Shevchenko, V. G.; Tholen, D. J.; Velichko, F. P.; Venditti, C.; Venditti, R.; Wisniewski, W.; Young, J.; Zellner, B. | |
| Journal: | Icarus, vol. 117, p. 71-89 (1995). | |
| Publication Date: | 09/1995 | |
| DOI: | 10.1006/icar.1995.1143 | |
| ^ Top ^ |
| Title: | A Search for a Pulsar in the Remnant of SN 1987A with the Hubble Space Telescope High-Speed Photometer | |
| Authors: | Percival, J. W.; Boyd, P. T.; Biggs, J. D.; Dolan, J. F.; Bless, R. C.; Elliot, J. L.; Nelson, M. J.; Robinson, E. L.; Taylor, M. J.; van Citters, G. W.; Wolinski, K. G. | |
| Journal: | Astrophysical Journal v.446, p.832 | |
| Publication Date: | 06/1995 | |
| Keywords: | TECHNIQUES: PHOTOMETRIC, STARS: PULSARS: INDIVIDUAL ALPHANUMERIC: SN 1987A, ULTRAVIOLET: STARS | |
| DOI: | 10.1086/175840 |
| Full text available - email J Biggs | ^ Top ^ |
| Title: | Southern Hemisphere automated supernova search. | |
| Authors: | Williams, A. J.; Martin, R.; Verveer, A.; Blair, D. G.; Koch, R.; Lynch, M. J. & Burman, R. | |
| Journal: | Review of Scientific Instruments, Volume 66, Issue 4, April 1995, pp.2777-2784. | |
| Publication Date: | 04/1995 | |
| ^ Top ^ |
| Title: | Multi-Site Observations of the DAV White Dwarf R 548 | |
| Authors: | Kepler, S. O.; Giovannini, O.; Costa, A. F. M.; Winget, D. E.; Nather, R. E.; Kanaan, A.; Kleinman, S. J.; Marar, T. M. K.; Ashoka, B. N.; Mahra, H. S.; Solheim, J.-E.; Emanuelsen, P.-I.; Olsen, O.; Meistas, E. G.; Tereshchenko, V.; Kardapolov, V.; Rspaev, F.; Sullivan, D. J.; Wickramasinghe, D. T.; Bessell, M. S.; Wu, K.; O'Donoghue, D.; Buckley, D. A.; Warner, B.; Haswell, C.; Baptista, R.; Neill, D.; Birch, P. | |
| Journal: | Baltic Astronomy, v.4, p.238-244. | |
| Publication Date: | 00/1995 | |
| Keywords: | STARS: WHITE DWARFS, VARIABLE, STARS: INDIVIDUAL: R 548 | |
| ^ Top ^ |
| Title: | The Detection of Cyclic Frequency Variability in the Rapidly Oscillating Ap-Star HD134214 | |
| Authors: | Kreidl, T. J.; Kurtz, D. W.; Schneider, H.; van Wyk, F.; Roberts, G.; Marang, F.; Birch, P. V. | |
| Journal: | R.A.S. MONTHLY NOTICES V.270, NO. 1/SEP1, P. 115, 1994 | |
| Publication Date: | 09/1994 | |
| ^ Top ^ |
| Title: | Whole earth telescope observations of the DBV white dwarf GD 358 | |
| Authors: | Winget, D. E.; Nather, R. E.; Clemens, J. C.; Provencal, J. L.; Kleinman, S. J.; Bradley, P. A.; Claver, C. F.; Dixson, J. S.; Montgomery, M. H.; Hansen, C. J.; Hine, B. P.; Birch, P.; Candy, M.; Marar, T. M. K.; Seetha, S.; Ashoka, B. N.; Leibowitz, E. M.; O'Donoghue, D.; Warner, B.; Buckley, D. A. H.; Tripe, P.; Vauclair, G.; Dolez, N.; Chevreton, M.; Serre, T.; Garrido, R.; Kepler, S. O.; Kanaan, A.; Augusteijn, T.; Wood, M. A.; Bergeron, P.; Grauer, A. D. | |
| Journal: | The Astrophysical Journal, vol. 430, no. 2, pt. 1, p. 839-849 | |
| Publication Date: | 08/1994 | |
| Keywords: | LIGHT CURVE, STELLAR LUMINOSITY, STELLAR MAGNETIC FIELDS, STELLAR MASS, STELLAR ROTATION, STELLAR SPECTRA, WHITE DWARF STARS, ASTROPHYSICS, MAGNETIC FLUX, SEISMOLOGY, SPECTRUM ANALYSIS, STELLAR ATMOSPHERES, STELLAR EVOLUTION | |
| DOI: | 10.1086/174455 | |
| ^ Top ^ |
| Title: | Supernova 1993k - First Photometric Results | |
| Authors: | Wiliams, A. J.; Martin, R.; Koch, R.; Blair, D. G.; Lynch, M. | |
| Journal: | Experimental Astronomy, v. 5, p. 151. | |
| Publication Date: | 00/1994 | |
| ^ Top ^ |
| Title: | High-speed photometric observations of the pulsating DA white dwarf GD 165 | |
| Authors: | Bergeron, P.; Fontaine, G.; Brassard, P.; Lamontagne, R.; Wesemael, F.; Winget, D. E.; Nather, R. E.; Bradley, P. A.; Claver, C. F.; Clemens, J. C.; Kleinman, S. J.; Provencal, J.; McGraw, J. T.; Birch, P.; Candy, M.; Buckley, D. A.; Tripe, P.; Augusteijn, T.; Vauclair, G.; Kepler, S. O.; Kanaan, A. | |
| Journal: | Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1987-1999 | |
| Publication Date: | 11/1993 | |
| Keywords: | FREQUENCY DISTRIBUTION, HARMONIC OSCILLATION, HIGH SPEED PHOTOGRAPHY, LIGHT CURVE, TEMPORAL RESOLUTION, WHITE DWARF STARS, ASTRONOMICAL MODELS, ASTRONOMICAL PHOTOMETRY, FOURIER ANALYSIS, HYDROGEN, PHOTOMETRY, SIGNAL TO NOISE RATIOS, TELESCOPES, VARIABILITY | |
| DOI: | 10.1086/116780 | |
| ^ Top ^ |
| Title: | CCD imaging of Comet Wilson (1987VII) - A quantitative coma analysis | |
| Authors: | Schulz, Rita; A'Hearn, Michael F.; Birch, Peter V.; Bowers, Craig; Kempin, Mark; Martin, Ralph | |
| Journal: | Icarus (ISSN 0019-1035), vol. 104, no. 2, p. 206-225. | |
| Publication Date: | 08/1993 | |
| Keywords: | CARBON, CHARGE COUPLED DEVICES, CN EMISSION, COMET TAILS, IMAGING TECHNIQUES, SPECTRAL BANDS, FREE RADICALS, NARROWBAND, SPECTRAL EMISSION | |
| DOI: | 10.1006/icar.1993.1096 | |
| ^ Top ^ |
| Title: | Comet Levy (1990c) - Groundbased photometric results | |
| Authors: | Schleicher, David G.; Millis, Robert L.; Osip, David J.; Birch, Peter V. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 94, Dec. 1991, p. 511-523. | |
| Publication Date: | 12/1991 | |
| Keywords: | COMETARY ATMOSPHERES, LIGHT CURVE, OKAZAKI-LEVY-RUDENKO COMET, SOLAR ORBITS, SPACE OBSERVATIONS (FROM EARTH), ULTRAVIOLET PHOTOMETRY, AMMONIA, ASTRONOMICAL OBSERVATORIES, CARBON, CYANO COMPOUNDS, HYDROXYL RADICALS, IUE | |
| DOI: | 10.1016/0019-1035(91)90244-N | |
| ^ Top ^ |
| Title: | An analysis of the 1985 observations of mutual phenomena of the Galilean satellites | |
| Authors: | Franklin, Fred A.; Galilean Satellite Observers; Africano, John; Allen, William; Aksnes, Kaare; Birch, Peter; Blanco, Carlo; Coulson, Iain; Goguen, Jay; Sinton, William; Jones, Robert; Rettig, David; Langhans, Thomas; Marcialis, Robert; Millis, Robert; Wasserman, Lawrence; Nakamura, Tsuko; Soma, Mitsuru; Shi, Mitaka; Rowe, Clive; Solheim, Jan-Erik; Skillman, David; Walters, James; Weller, William; Westfall, John | |
| Journal: | Astronomical Journal (ISSN 0004-6256), vol. 102, Aug. 1991, p. 806-815. | |
| Publication Date: | 08/1991 | |
| Keywords: | ASTROMETRY, ECLIPSES, GALILEAN SATELLITES, LIGHT CURVE, ASTRONOMICAL PHOTOMETRY, JUPITER SATELLITES, RADIO OCCULTATION | |
| DOI: | 10.1086/115912 | |
| ^ Top ^ |
| Title: | A frequency analysis of new observations of the rapidly oscillating AP star HD 217522 - Evidence for mode-switching | |
| Authors: | Kreidl, T. J.; Kurtz, D. W.; Bus, S. J.; Kuschnig, R.; Birch, P. B.; Candy, M. P.; Weiss, W. W. | |
| Journal: | Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 250, May 15, 1991, p. 477-480. | |
| Publication Date: | 05/1991 | |
| Keywords: | A STARS, ASTRONOMICAL PHOTOMETRY, COOL STARS, FREQUENCY DISTRIBUTION, PECULIAR STARS, STELLAR OSCILLATIONS, AMPLITUDE MODULATION, ELECTROPHOTOMETRY, LEAST SQUARES METHOD | |
| ^ Top ^ |
| Title: | Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images | |
| Authors: | Lockwood, G. W.; Thompson, D. T.; Hammel, H. B.; Birch, P.; Candy, M. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 90, April 1991, p. 299-307. | |
| Publication Date: | 04/1991 | |
| Keywords: | CLOUD PHYSICS, LIGHT CURVE, NEPTUNE ATMOSPHERE, PLANETARY METEOROLOGY, SATELLITE IMAGERY, SPACE OBSERVATIONS (FROM EARTH), CHARGE COUPLED DEVICES, DIGITAL TECHNIQUES, ELECTROPHOTOMETRY, METHANE, SECULAR VARIATIONS, VOYAGER 2 SPACECRAFT | |
| DOI: | 10.1016/0019-1035(91)90108-6 | |
| ^ Top ^ |
| Title: | Status of the Perth Observatory Automated Supernova Search Program | |
| Authors: | Williams, A. J.; Blair, D. G.; Burman, R.; Evans, M.; Martin, R.; Birch, R. V.; Candy, M. R.; Verveer, A.; Koch, R.; Lynch, M. J.; Dai, X.; Zadnik, M. G.; Foster, D. | |
| Journal: | Proceedings of the Astronomical Society of Australia, volume 9, page 84-85. | |
| Publication Date: | 00/1991 | |
| ^ Top ^ |
| Title: | Standard stars for photometry of comets | |
| Authors: | Osborn, Wayne H.; A'Hearn, Michael F.; Carsenty, Uri; Millis, Robert L.; Schleicher, David G.; Birch, P. V.; Moreno, H.; Gutierrez-Moreno, A. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 88, Nov. 1990, p. 228-245. | |
| Publication Date: | 11/1990 | |
| Keywords: | ASTRONOMICAL PHOTOMETRY, HALLEY'S COMET, REFERENCE STARS, STELLAR MAGNITUDE, CARBON, CARBON MONOXIDE, CYANO COMPOUNDS, MOLECULAR IONS, WATER VAPOR | |
| DOI: | 10.1016/0019-1035(90)90187-E | |
| ^ Top ^ |
| Title: | Periodic variations in the activity of Comet P/Halley during the 1985/1986 apparition | |
| Authors: | Schleicher, David G.; Millis, Robert L.; Thompson, Don T.; Birch, Peter V.; Martin, Ralph; Tholen, David J.; Piscitelli, Joseph R.; Lark, Neil L.; Hammel, Heidi B. | |
| Journal: | Astronomical Journal (ISSN 0004-6256), vol. 100, Sept. 1990, p. 896-912. | |
| Publication Date: | 09/1990 | |
| Keywords: | ASTRONOMICAL PHOTOMETRY, HALLEY'S COMET, PERIODIC VARIATIONS, ASTRONOMICAL OBSERVATORIES, COSMIC DUST, INTERSTELLAR GAS, LIGHT CURVE | |
| DOI: | 10.1086/115570 | |
| Abstract | ||
| A search for periodic variation in the production of gas and dust by Comet Halley has been performed using narrowband photometric measurements from four sites - Lowell Observatory, Mauna Kea Observatory, Perth Observatory, and Cerro Tololo Inter-American Observatory. The method of phase dispersion minimization was applied to observations made during 164 observing nights between September 1985 and June 1986. A clear-cut variation, with a period near 7.4 days, was present throughout the postperihelion window. Less conclusive evidence of a similar period has been found in the pre-perihelion data. No indication of a shorter period or of strong sporadic activity exists in the data. The observations require that Halley's nucleus returns to essentially the same orientation with respect to the sun approximately every 7.4 days except for longer-timescale seasonal evolution. This fact precludes certain proposed models of nuclear motion. | ||
| ^ Top ^ | ||
| Title: | Seasonal recession of Mars' south polar CAP in 1986 | |
| Authors: | James, P. B.; Martin, L. J.; Henson, J. R.; Birch, P. V. | |
| Journal: | Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Feb. 10, 1990, p. 1337-1341. | |
| Publication Date: | 02/1990 | |
| Keywords: | ANNUAL VARIATIONS, MARS ATMOSPHERE, MARS PHOTOGRAPHS, POLAR CAPS, SATELLITE IMAGERY, MARINER 9 SPACE PROBE, VIKING ORBITER SPACECRAFT | |
| ^ Top ^ |
| Title: | Lightcurves and pole position of asteroid 3 Juno | |
| Authors: | Birch, P. V.; Taylor, R. C. | |
| Journal: | Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 81, no. 3, Dec. 1989, p. 409-414. | |
| Publication Date: | 12/1989 | |
| Keywords: | ASTEROIDS, ASTROMETRY, ASTRONOMICAL PHOTOMETRY, LIGHT CURVE, CELESTIAL MECHANICS, ROTATION, SIDEREAL TIME | |
| ^ Top ^ |
| Title: | Spatial structure in the color of the dust coma of Comet P/Halley | |
| Authors: | Hoban, S.; A'Hearn, M. F.; Birch, P. V.; Martin, R. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 79, May 1989, p. 145-158. | |
| Publication Date: | 05/1989 | |
| Keywords: | COLOR, COMA, COMETARY ATMOSPHERES, HALLEY'S COMET, IMAGE PROCESSING, INTERPLANETARY DUST, MIE SCATTERING, SPATIAL DISTRIBUTION | |
| DOI: | 10.1016/0019-1035(89)90113-9 | |
| ^ Top ^ | ||
| Abstract | ||
| Significant spatial variations are noted in the color of the dust in Comet Halley's dust coma, out to 156,000 km from the optocenter, in the present March 1-6, 1986 narrowband CCD images. In particular, the envelope of intermediate-mass particles formed around the nucleus by solar radiation pressure is redder than the rest of the dust coma, and a strong jet noted in the March 1 images is redder than both the dust envelope and the remainder of the dust coma. A wavelength-dependence model of the Comet Halley dust's color is developed on the basis of Mie theory. | ||
| ^ Top ^ | ||
| Title: | Asteroid 45 Eugenia - Lightcurves and the pole orientation | |
| Authors: | Taylor, R. C.; Birch, P. V.; Pospieszalska-Surdej, A.; Surdej, J. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 73, Feb. 1988, p. 314-323. | |
| Publication Date: | 02/1988 | |
| Keywords: | ASTEROIDS, LIGHT CURVE, MAGNETIC POLES, ALBEDO, ASTRONOMICAL PHOTOMETRY, COORDINATES, MAGNITUDE, SIDEREAL TIME | |
| DOI: | 10.1016/0019-1035(88)90101-7 | |
| ^ Top ^ |
| Title: | Photometric observations of comet P/Giacobini-Zinner | |
| Authors: | Schleicher, D. G.; Millis, R. L.; Birch, P. V. | |
| Journal: | Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 531-538. | |
| Publication Date: | 11/1987 | |
| Keywords: | ABUNDANCE, ASTRONOMICAL PHOTOMETRY, GIACOBINI-ZINNER COMET, MOLECULAR SPECTRA, CARBON, CYANOGEN, HYDROXYL RADICALS, INTERNATIONAL SUN EARTH EXPLORER 3, NITROGEN | |
| ^ Top ^ |
| Title: | Asteroid 532 Herculina - Lightcurves, pole orientation and a model | |
| Authors: | Taylor, R. C.; Birch, P. V.; Drummond, J.; Pospieszalska-Surdej, A.; Surdej, J. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 69, Feb. 1987, p. 354-369. | |
| Publication Date: | 02/1987 | |
| Keywords: | ASTEROIDS, LIGHT CURVE, PLANETARY ROTATION, POLES, ASTRONOMICAL MODELS, ELECTROPHOTOMETRY | |
| DOI: | 10.1016/0019-1035(87)90111-4 | |
| ^ Top ^ |
| Title: | Cyanogen jets in comet Halley | |
| Authors: | A'hearn, Michael F.; Hoban, Susan; Birch, Peter V.; Bowers, Craig; Martin, Ralph; Klinglesmith, Daniel A., III | |
| Journal: | Nature (ISSN 0028-0836), vol. 324, Dec. 25, 1986, p. 649-651. | |
| Publication Date: | 12/1986 | |
| Keywords: | ASTRONOMICAL PHOTOMETRY, CN EMISSION, CYANOGEN, GAS JETS, HALLEY'S COMET, ANGULAR MOMENTUM, CHARGE COUPLED DEVICES | |
| ^ Top ^ |
| Title: | Comet Encke - Gas production and lightcurve | |
| Authors: | A'Hearn, M. F.; Birch, P. V.; Feldman, P. D.; Millis, R. L. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 64, Oct. 1985, p. 1-10. | |
| Publication Date: | 10/1985 | |
| Keywords: | ASTRONOMICAL PHOTOMETRY, ENCKE COMET, GAS EVOLUTION, CYANOGEN, HYDROXYL RADICALS, IUE, LIGHT CURVE, SPACE OBSERVATIONS (FROM EARTH) | |
| DOI: | 10.1016/0019-1035(85)90033-8 | |
| ^ Top ^ |
| Title: | Addendum - Mutual Phenomena of the Galilean and Saturnian Satellites in 1973 and 1979/1980 | |
| Authors: | Aksnes, K.; Franklin, F.; Millis, R.; Birch, P.; Blanco, C.; Catalano, S.; Piironen, J. | |
| Journal: | ASTRONOMICAL JOURNAL V. 89:7, NO.1542, P.1081, 1984 | |
| Publication Date: | 07/1984 | |
| DOI: | 10.1086/113606 | |
| ^ Top ^ |
| Title: | Mutual phenomena of the Galilean and Saturnian satellites in 1973 and 1979/1980 | |
| Authors: | Aksnes, K.; Franklin, F.; Millis, R.; Birch, P.; Blanco, C.; Catalano, S.; Piironen, J. | |
| Journal: | Astronomical Journal (ISSN 0004-6256), vol. 89, Feb. 1984, p. 280-288. | |
| Publication Date: | 02/1984 | |
| Keywords: | ASTROMETRY, ECLIPSES, GALILEAN SATELLITES, OCCULTATION, SATURN SATELLITES, ASTRONOMICAL CATALOGS, ASTRONOMICAL PHOTOMETRY, LIGHT CURVE, ORBITAL ELEMENTS, RADII | |
| DOI: | 10.1086/113511 | |
| ^ Top ^ |
| Title: | Photoelectric lightcurves and rotation period of the minor planet 201 Penelope | |
| Authors: | Surdej, J.; Louis, B.; Cramer, N.; Rufener, F.; Waelkens, C.; Barbier, R.; Birch, P. V. | |
| Journal: | Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 54, Nov. 1983, p. 371-378. | |
| Publication Date: | 11/1983 | |
| Keywords: | ASTEROIDS, ASTRONOMICAL PHOTOMETRY, ELECTROPHOTOMETRY, LIGHT CURVE, PLANETARY ROTATION, COLOR, MAGNITUDE, PERIODIC VARIATIONS, TIME MEASUREMENT, UBV SPECTRA | |
| ^ Top ^ |
| Title: | Lightcurves and phase function of asteroid 44 NYSA during its 1979 apparition | |
| Authors: | Birch, P. V.; Tedesco, E. F.; Taylor, R. C.; Binzel, R. P.; Blanco, C.; Catalano, S.; Hartigan, P.; Scaltriti, F.; Tholen, D. J.; Zappala, V. | |
| Journal: | Icarus (ISSN 0019-1035), vol. 54, April 1983, p. 1-12. | |
| Publication Date: | 04/1983 | |
| Keywords: | ASTEROIDS, LIGHT CURVE, MAGNITUDE, ORBITAL ELEMENTS, PHASE SHIFT, ASTRONOMICAL PHOTOMETRY, MAXIMA, MINIMA, UBV SPECTRA | |
| DOI: | 10.1016/0019-1035(83)90066-0 | |
| ^ Top ^ |
| Title: | Comet Bradfield 1979 X - The gassiest comet | |
| Authors: | A'Hearn, M. F.; Millis, R. L.; Birch, P. V. | |
| Journal: | Astronomical Journal, vol. 86, Oct. 1981, p. 1559-1566. | |
| Publication Date: | 10/1981 | |
| Keywords: | ASTRONOMICAL PHOTOGRAPHY, COMETS, INTERPLANETARY GAS, MOLECULAR GASES, CN EMISSION, EMISSION SPECTRA, GAS DENSITY, HYDROXYL EMISSION, RATES (PER TIME) | |
| DOI: | 10.1086/113039 | |
| ^ Top ^ |
| Title: | Gas and dust in some recent periodic comets | |
| Authors: | A'Hearn, M. F.; Millis, R. L.; Birch, P. V. | |
| Journal: | Astronomical Journal, vol. 84, Apr. 1979, p. 570-579. | |
| Publication Date: | 04/1979 | |
| Keywords: | ASTRONOMICAL PHOTOMETRY, CARBON, COMETS, COSMIC DUST, COSMIC GASES, ABUNDANCE, GRIGG-SKJELLERUP COMET, SIZE DETERMINATION | |
| DOI: | 10.1086/112452 | |
| ^ Top ^ |
| Title: | 1580 Betulia - an unusual asteroid with an extraordinary lightcurve | |
| Authors: | Tedesco, E.; Drummond, J.; Candy, M.; Birch, P.; Nikoloff, I.; Zellner, B. | |
| Journal: | Icarus, vol. 35, Sept. 1978, p. 344-359. | |
| Publication Date: | 09/1978 | |
| Keywords: | ASTEROIDS, ASTRONOMICAL PHOTOMETRY, LIGHT CURVE, UBV SPECTRA, ELECTROPHOTOMETRY, GRAPHS (CHARTS), PHASE SHIFT, PLANETARY ROTATION | |
| DOI: | 10.1016/0019-1035(78)90087-8 | |
| ^ Top ^ |
| Title: | Detection of rings around Uranus | |
| Authors: | Millis, R. L.; Wasserman, L. H.; Birch, P. V. | |
| Journal: | Nature, vol. 267, May 26, 1977, p. 330, 331. | |
| Publication Date: | 05/1977 | |
| Keywords: | ASTRONOMICAL PHOTOMETRY, PLANETARY STRUCTURE, RING STRUCTURES, STELLAR OCCULTATION, URANUS (PLANET), LIGHT CURVE | |
| ^ Top ^ |
| Title: | A search for posteclipse brightening of Io in 1973. I | |
| Authors: | Millis, R. L.; Harris, B. J.; Birch, P.; Sefton, R.; Thompson, D. T. | |
| Journal: | Icarus, vol. 23, Nov. 1974, p. 425-430. | |
| Publication Date: | 11/1974 | |
| Keywords: | ECLIPSES, IO, JUPITER (PLANET), LIGHT CURVE, SKY BRIGHTNESS, ASTRONOMICAL PHOTOMETRY, LIGHT SCATTERING, LUMINOUS INTENSITY | |
| ^ Top ^ |
Shortcut to refereed publications
Shortcut to last publication in each year: 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 1990
| Title: | Supernova 2009jy in NGC 3208 | |
| Authors: | Martin, R.; Jacques, C. and Pimentel, E. | |
| Journal: | Central Bureau Electronic Telegrams, 1983, 1 (2009). Edited by Green, D. W. E. | |
| Publication Date: | 10/2009 | |
| ^ Top ^ |
| Title: | ATCA observation of SGR J1550-5418 | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | The Astronomer's Telegram, #1965 | |
| Publication Date: | 03/2009 | |
| Abstract | ||
| We observed the SWIFT-BAT position of recently re-activated Soft Gamma-ray Repeater source SGR J1550-5418 or AXP 1E1547-5408 (GCN 8833) at 4.800 and 4.928 GHz with the Australia Telescope Compact Array (ATCA) between 01:00:00 UT and 22:00:00 UT on February 21/22, 2009. The ATCA observations of SGR J1550-5418 were conducted immediately before the VLBI ToO observations of the source with the Australian Long Baseline Array (LBA). | ||
| ^ Top ^ | ||
| Title: | Supernova 2009Y in NGC 5728 | |
| Authors: | Martin, R., Griffith, C., Cenko, S. B., Li, W. andFilippenko, A. V. | |
| Journal: | Central Bureau Electronic Telegrams, 1684, 1 (2009). Edited by Green, D. W. E. | |
| Publication Date: | 02/2009 | |
| ^ Top ^ |
| Title: | Radio observation of GRB 090201 with ATCA. | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | GRB Coordinates Network, Circular Service, 8955, 1 (2009) | |
| Publication Date: | 01/2009 | |
| ^ Top ^ |
| Title: | Radio observation of GRB 090117 with ATCA. | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | GRB Coordinates Network, Circular Service, 8954, 1 (2009) | |
| Publication Date: | 01/2009 | |
| ^ Top ^ |
| Title: | Radio observation of GRB 081226b with ATCA. | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | GRB Coordinates Network, Circular Service, 8953, 1 (2009) | |
| Publication Date: | 01/2009 | |
| ^ Top ^ |
| Title: | Radio observation of GRB 081226a with ATCA. | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | GRB Coordinates Network, Circular Service, 8952, 1 (2009) | |
| Publication Date: | 01/2009 | |
| ^ Top ^ |
| Title: | Radio observation of GRB 081007 with ATCA. | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | GRB Coordinates Network, Circular Service, 8951, 1 (2009) | |
| Publication Date: | 01/2009 | |
| ^ Top ^ |
| Title: | ATCA observation of Sgr J1550-5418. | |
| Authors: | Moin, A., Tingay, S., Phillips, C., Taylor, G., Wieringa, M. and Martin, R. | |
| Journal: | GRB Coordinates Network, Circular Service, 8950, 1 (2009) | |
| Publication Date: | 01/2009 | |
| ^ Top ^ |
| Title: | Western Australian Astronomy Almanac 2009 (and CD) | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 11/2008 | |
| ^ Top ^ |
| Title: | Supernova 2008gz in NGC 3672 | |
| Authors: | Nakano, S. and Martin, R. | |
| Journal: | Central Bureau Electronic Telegrams, 1566, 1 (2008). Edited by Green, D. W. E. | |
| Publication Date: | 11/2008 | |
| ^ Top ^ |
| Title: | Supernovae 2008fl and 2008fp | |
| Authors: | Martin, R. | |
| Journal: | Central Bureau Electronic Telegrams, 1509, 2 (2008). Edited by Green, D. W. E. | |
| Publication Date: | 09/2008 | |
| ^ Top ^ |
| Title: | Star cluster kinematics with AAOmega | |
| Authors: | Kiss, L. L., Balog, Z., Szabó, G. M., Parker, Q. A. and Frew, D. J. | |
| Journal: | Anglo-Australian Observatory Newsletter, No. 114, August 2008, p.9 | |
| Publication Date: | 08/2008 | |
| ^ Top ^ |
| Title: | Supernova 2008cn in NGC 4603 | |
| Authors: | Martin, R. et al. | |
| Journal: | Central Bureau Electronic Telegrams, 1385, 1 (2008). Edited by Green, D. W. E. | |
| Publication Date: | 05/2008 | |
| ^ Top ^ |
| Title: | Western Australian Astronomy Almanac 2008 (and CD) | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 12/2007 | |
| ^ Top ^ |
| Title: | Hunting for Frozen Super-Earths via Microlensing | |
| Authors: | Beaulieu, J-P.; Albrow, M.; Bennett, D.; Brillang, S.; Caldwell, J. A. R.; Calitz, J. J.; Cassan, A.; Cook, K. H.; Coutures, C.; Dieters, S.; Dominik, M.; Dominis-Prester, D.; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Hill, K.; Hoffman, M.; Jřrgensen, U. G.; Kane, S.; Kubas, D.; Marquette, J-B.; Martin, R.; Meintjes, P.; Menzies, J.; Pollard, K.; Sahu, K.; Vinter, C.; Wambsganss, J.; Williams, A.; Woller, K.; Zub, M.; Horne, K.; Allan, A.; Bode, M.; Bramich, D. M.; Burgdorf, M.; Fraser, S.; Mottram, C.; Rattenbury, N.; Snodgrass, C.; Steele, I. and Tsapras, Y. | |
| Journal: | The Messenger, 128 , page 33. | |
| Publication Date: | 06/2007 | |
| Abstract | ||
| In order to obtain a census of planets with masses in the range of Earth to Jupiter, eight telescopes are being used by the combined microlensing campaign of the PLANET and RoboNet collaborations for high-cadence photometric round-the-clock follow-up of ongoing events, alerted by the OGLE and MOA surveys. In 2005 we detected a planet of 5.5 Earth masses at 2.6 AU from its parent 0.22 MA M star. This object is the first member of a new class of cold telluric planets. Its detection confirms the power of this method and, given our detection efficiency, suggests that these recently-detected planets may be quite common around M stars, as confirmed by subsequent detection of a ~ 13 Earth-mass planet. Using a network of dedicated 1 2-m-class telescopes, we have entered a new phase of planet discovery, and will be able to provide constraints on the abundance of frozen Super-Earths in the near future. | ||
| ^ Top ^ | ||
| Title: | Planet-Hunting, "Transit-Style" | |
| Authors: | Jayawardene B.; White G.; Blank D.; Hons A.; Verveer A. and Biggs J. | |
| Journal: | Mercury, 36, no. 2, p. 26 (2007). | |
| Publication Date: | 04/2007 | |
| ^ Top ^ |
| Title: | Supernova 2007bn in NGC 7408 | |
| Authors: | Martin, R. | |
| Journal: | Central Bureau Electronic Telegrams, 940, 1 (2007). Edited by Green, D. W. E. | |
| Publication Date: | 04/2007 | |
| ^ Top ^ |
| Title: | Supernova 2007bm in NGC 3672 | |
| Authors: | Martin, R. | |
| Journal: | Central Bureau Electronic Telegrams, 936, 1 (2007). Edited by Green, D. W. E. | |
| Publication Date: | 04/2007 | |
| ^ Top ^ |
| Title: | Supernova 2007bl in ESO 239-G | |
| Authors: | Martin, R. | |
| Journal: | Central Bureau Electronic Telegrams, 935, 1 (2007). Edited by Green, D. W. E. | |
| Publication Date: | 04/2007 | |
| ^ Top ^ |
| Title: | Examples of new evolved planetary nebular from the SuperCOSMOS H-alpha survey | |
| Authors: | Birkby, J.; Parker, Q.; Miszalski, B.; Acker, A. and Frew, D. | |
| Journal: | Anglo-Australian Observatory Newsletter, No. 111, February 2007, p.22 | |
| Publication Date: | 02/2007 | |
| ^ Top ^ |
| Title: | Comet C/2006 P1 (McNaught) | |
| Authors: | Pearce, A.; Frew, D. J.; Drummond, J. and Souza, W. | |
| Journal: | IAU Circular, 8802, 3 (2007). Edited by Green, D. W. E. | |
| Publication Date: | 01/2007 | |
| ^ Top ^ |
| Title: | Comet C/2006 P1 (McNaught) | |
| Authors: | O'Meara, S. J.; Amorim, A.; Keen, R. A.; Morris, C. S.; Frew, D. J. and Hornoch, K. | |
| Journal: | IAU Circular, 8796, 4 (2007). Edited by Green, D. W. E. | |
| Publication Date: | 01/2007 | |
| ^ Top ^ |
| Title: | Western Australian Astronomy Almanac 2007 (and CD) | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 11/2006 | |
| ^ Top ^ |
| Title: | The Composition of the Interior of Comet 73P/Schwassmann-Wachmann 3: Results from Narrowband Photometry of Multiple Components | |
| Authors: | Schleicher, David G.; Birch, P. V.; Bair, A. N. | |
| Journal: | American Astronomical Society, DPS meeting #38, #03.04 | |
| Publication Date: | 09/2006 | |
| ^ Top ^ |
| Title: | Western Australian Astronomy Almanac 2006 (and CD) | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 12/2005 | |
| ^ Top ^ |
| Title: | A Photometric Monitoring Campaign to Check for Planetary Transits of GJ 876 | |
| Authors: | Shankland, P. D.; Blank, D.; Laughlin, G.; Price, A.; Gary, B.; Bissinger, R.; Ringwald, F.; White, G.; Ashbey, M.; Greenhill, J.; McGee, P.; Sinclair, S.; Carter, B.; Lee, S.; Biggs, J.; Tabur, V.; Roy, A.; Santallo, R.; Kilmartin, P.; Higgins, D.; Nelson, P.; Richards, T.; Heathcote, B.; Stockdale, C.; Kereszty, Z.; .Laurent, J. dePonthiere, P.; Johnston, K. J.; Lazio, J.; .Knapp, C.; Dvorak, S.; Fleenor, M.; Case, J.; Koppelman, M.; Wells, D.; Dillon, W.; Koff, R.; James, R.; Holtzman, J.; Huziak, R. | |
| Journal: | American Astronomical Society Meeting 206, #09.08 | |
| Publication Date: | 05/2005 | |
| Abstract | ||
| Radial Velocity Observations have shown that the nearby M4 V dwarf GJ 876 is accompanied by two massive planets in a 2:1 mean motion resonance (Marcy et al 2001). Astrometric observations with HST (Benedict et al 2002) suggest that the plane of the outer planet has an inclination, i=84° ± 6°, indicating that the system is a good candidate for photometric follow-up to check for transits of the two planets. We report results from a multi-observer campaign carried out during 2004, which indicate that neither planet is currently transiting. We present dynamical models of the system which indicate that future transits of the inner planet may be observed in the future, provided that the orbital planes of the two planets possess several degrees of mutual inclination. | ||
| ^ Top ^ | ||
| Title: | Supernova 2005am in NGC 2811 | |
| Authors: | Martin, R.; Yamaoka, H.; Itagaki, K. | |
| Journal: | IAU Circ., 8490, 1 (2005). Edited by Green, D. W. E. | |
| Publication Date: | 03/2005 | |
| ^ Top ^ |
| Title: | Supernova 2005ae in ESO 209-9 | |
| Authors: | Martin, R. | |
| Journal: | IAU Circ., 8480, 1 (2005). Edited by Green, D. W. E. | |
| Publication Date: | 02/2005 | |
| ^ Top ^ |
| Title: | Mid-IR Spectroscopy of Dusty Protostellar Disks: A Game Plan | |
| Authors: | Sitko, M. L.; Bauer, A. E.; Brafford, S. M.; Lynch, D. K.; Russell, R. W.; Grady, C. A.; Molster, F. J.; Bradley, J. P.; Calvet, N.; Hartmann, L.; Nuth, J. A., III; Hill, H. G. M.; Biggs, J. D.; Hanner, M. S. | |
| Journal: | Debris Disks and the Formation of Planets: A Symposium in Memory of Fred Gillett, ASP Conference Series, Vol. 324, Proceedings of the conference held 11-13 April, 2002 in Tucson Arizona. Edited by L. Caroff, L. J. Moon, D. Backman, and E. Praton. San Francisco: Astronomical Society of the Pacific, 2004., p.221 | |
| Publication Date: | 12/2004 | |
| Abstract | ||
| With the advent of new laboratory analytical tools and in situ detectors in space, the analysis of solids in space is on the verge of becoming a true, experimentally-based science. Here we outline a broad strategy for studying the mineralogical nature of solids in dusty protostellar disks. | ||
| ^ Top ^ | ||
| Title: | The PLANET Microlensing Campaign: Implications for Planets around Galactic Disk and Bulge Stars | |
| Authors: | Dominik, M., Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Cassan, A.; Coutures, C.; Greenhill, J.; Hill, K.; Fouqué , P.; Horne, K.; Jorgensen, U. G.; Kane, S.; Kubas, D.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K.; Wambsganss, J.; Watson, R.; Williams, A. | |
| Journal: | Extrasolar Planets: Today and Tomorrow, ASP Conference Proceedings, Vol. 321, held 30 June - 4 July 2003, Institut D'Astrophysique de Paris, France. Edited by Jean-Philippe Beaulieu, Alain Lecavelier des Etangs and Caroline Terquem. ISBN: 1-58381-183-4, 2004, p.121 | |
| Publication Date: | 12/2004 | |
| Abstract | ||
| With round-the-clock monitoring of galactic bulge microlensing events, the PLANET experiment constrains the abundance and can yield the discovery of planets down to the mass of earth around galactic disk and bulge stars. Data taken until 1999 imply that less than 1/3 of bulge M-dwarfs are surrounded by jupiter-mass companions at orbital radii between 1 and 4 AU. The current rate of microlensing alerts allows 15--25 jupiters and 1--3 earths to be probed per year. | ||
| ^ Top ^ | ||
| Title: | Western Australian Astronomy Almanac 2005 | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 11/2004 | |
| ^ Top ^ |
| Title: | PLANET II: A Microlensing and Transit Search for Extrasolar Planets | |
| Authors: | Sackett, Penny D.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Coutures, C.; Dominik, M.; Greenhill, J.; Hill, K.; Horne, K.; Jorgensen, U.-G.; Kane, S.; Kubas, D.; Martin, R.; Menzies, J. W.; Pollard, K. R.; Sahu, K. C.; Wambsganss, J.; Watson, R.; Williams, A. | |
| Journal: | Bioastronomy 2002: Life Among the Stars, Proceedings of IAU Symposium #213. Edited by R. Norris, and F. Stootman. San Francisco: Astronomical Society of the Pacific, 2003., p.35 | |
| Publication Date: | 06/2004 | |
| Abstract | ||
| Due to their extremely small luminosity compared to the stars they orbit, planets outside our own Solar System are extraordinarily difficult to detect directly in optical light. Careful photometric monitoring of distant stars, however, can reveal the presence of exoplanets via the microlensing or eclipsing effects they induce. The international PLANET collaboration is performing such monitoring using a cadre of semi-dedicated telescopes around the world. Their results constrain the number of gas giants orbiting 1--7 AU from the most typical stars in the Galaxy. Upgrades in the program are opening regions of ``exoplanet discovery space'' -- toward smaller masses and larger orbital radii -- that are inaccessible to the Doppler velocity technique. | ||
| ^ Top ^ | ||
| Title: | Supernova 2004ch in NGC 5612 | |
| Authors: | Martin, R. | |
| Journal: | IAU Circ., 8353, 1 (2004). Edited by Green, D. W. E. | |
| Publication Date: | 06/2004 | |
| ^ Top ^ |
| Title: | Supernova 2004S in MCG -05-16-21 | |
| Authors: | Martin, R.; Biggs, J. | |
| Journal: | IAU Circ., 8282, 1 (2004). Edited by Green, D. W. E. | |
| Publication Date: | 02/2004 | |
| ^ Top ^ |
| Title: | Are we ETs? An Update on the Panspermia Hypothesis | |
| Authors: | Biggs, J. | |
| Journal: | Proceedings of the Iron and Sulphur Bacteria Workshop, Murdoch University, 11-14 February 2004, ISBW Planning Committee eds., Scott, B.; Walker, C. | |
| Publication Date: | 00/2004 | |
| ^ Top ^ |
| Title: | Western Australian Astronomy Almanac 2004 | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 12/2003 | |
| ^ Top ^ |
| Title: | Supernova 2003jg in NGC 2997 | |
| Authors: | Biggs, J.; Monard, L. A. G.; | |
| Journal: | IAU Circ., 8236, 3 (2003). Edited by Green, D. W. E. | |
| Publication Date: | 11/2003 | |
| ^ Top ^ |
| Title: | Supernova 2003jg in NGC 2997 | |
| Authors: | Martin, R.; Biggs, J. | |
| Journal: | IAU Circ., 8235, 1 (2003). Edited by Green, D. W. E. | |
| Publication Date: | 10/2003 | |
| ^ Top ^ |
| Title: | Western Australian Astronomy Almanac 2003 | |
| Authors: | Biggs, J. D., ed. | |
| Publisher: | Perth Observatory, Perth, WA | |
| Publication Date: | 12/2002 | |
| ^ Top ^ |
| Title: | The PLANET microlensing follow-up network: results and prospects for the detection of extra-solar planets | |
| Authors: | Dominik, M.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | Planetary and Space Science, Volume 50, Issue 3, p. 299-307. | |
| Publication Date: | 03/2002 | |
| Abstract | ||
| Among various techniques to search for extra-solar planets, microlensing has some unique characteristics. Contrary to all other methods which favour nearby objects, microlensing is sensitive to planets around stars at distances of several kpc. These stars act as gravitational lenses leading to a brightening of observed luminous source stars. The lens stars that are tested for the presence of planets are not generally seen themselves. The largest sensitivity is obtained for planets at orbital separations of 1-10AU offering the view on an extremely interesting range with regard to our own solar system and in particular to the position of Jupiter. The microlensing signal of a jupiter-mass planet lasts typically a few days. This means that a planet reveals its existence by producing a short signal at its quasi-instantaneous position, so that planets can be detected without the need to observe a significant fraction of the orbital period. Relying on the microlensing alerts issued by several survey groups that observe ~107 stars in the Galactic bulge. PLANET (Probing Lensing Anomalies NETwork) performs precise and frequent measurements on ongoing microlensing events in order to detect deviations from a light curve produced by a single point-like object. These measurements allow constraints to be put on the abundance of planets. From 42 well-sampled events between 1995 and 1999, we infer that less than /1/3 of M-dwarfs in the Galactic bulge have jupiter-mass companions at separations between 1 and 4AU from their parent star, and that /< 45% have 3-jupiter-mass companions between 1 and 7AU. | ||
| ^ Top ^ | ||
| Title: | Night and Day Under an Outback Sky: An astronomical adventure 2001 | |
| Authors: | Patrick S.; Biggs, J. D., eds. | |
| Journal: | Landscope Expedition Report No. 43, CALM, Perth, WA | |
| Publication Date: | 00/2002 | |
| ^ Top ^ |
| Title: | The Environment and Wind of the Herbig Ae Star HD 104237: HST/STIS Coronagraphic Imaging and HST/STIS and FUSE FUV spectroscopy | |
| Authors: | Danks, A.; Vieira, G.; Grady, C.; Woodgate, B.; Brown, A.; Harper, G.; Wilkinson, E.; Herczeg, C.; Sitko, M.; Bauer, A.; Biggs, J. | |
| Journal: | American Astronomical Society, 199th AAS Meeting, #60.14; Bulletin of the American Astronomical Society, Vol. 33, p.1396 | |
| Publication Date: | 12/2001 | |
| Abstract | ||
| We present HST/STIS white light coronagraphic imaging, STIS FUV low dispersion spectroscopy and FUSE moderate resolution spectroscopy supplemented by optical photometry of the nearby Herbig Ae star HD 104237. The coronagraphic data reveal a nearby star, hereafter termed HD 104237B, offset 1.4" (162 AU) from the Ae star as well as three additional bright stars more than 10" from HD 104237. All four nearby stars have magnitudes and colors, inferred from the shape of the PSF wings, characteristic of M8-M9 T Tauri stars. One of the companions varied significantly in the course of the first STIS coronagraphic imaging suite, consistent with flaring. The proximity of these stars indicate that the Herbig Ae star, hereafter termed HD 104237A, is located in a small T association. The proximity of the nearest companion to HD 104237 is consistent with the anomalously bright x-ray emission from HD 104237 originating at least partially on the companion, as originally suggested by Skinner & Yamauchi (1996). No circumstellar disk is visible in the STIS images, implying an outer disk radius below 57 AU, as expected from tidal truncation of HD 104237A disk by HD 104237B. STIS low resolution long slit spectra covering 1150-1700 Å were obtained with the 52x0.2" slit in the same orbits as the coronagraphic images. Both spectra resolve the wind in Lyman alpha, with an outer radius of at least 1.3" (150 AU) at PA=339°. We also detect molecular hydrogen emission beyond the Ly alpha emission in both spectra at PA=319 and 339°. At PA=339°, the molecular hydrogen emission extends from 1.4 to 2.0" (160-230 AU). The FUSE, HST/GHRS and STIS spectra of HD104237 show a wide range of chromospheric and transition region emission lines. All except the hottest lines, i.e. N V and O VI, show the presence of a high velocity outflow with a maximum speed of ~ -300 km s-1. The O VI 1032 Å profile shows strong H2 molecular absorptions that lead to fluorecent FUV H2 emissions. This study is part of the STIS Guaranteed Time Observation program, which is supported NASA GTO funding to the STIS Science Team in response to NASA A/O OSSA -4-84 through the HST Project at GSFC. CAG is supported through interagency transfer of funds to NOAO. A. Brown, GH, and E.W. are supported through LTSA grants NAG5-3226 and NAG5-4808. MS and A. Bauer are supported through the Ohio Space Grant program. | ||
| ^ Top ^ | ||
| Title: | 1RXS J232953.9+062814 | |
| Authors: | Biggs, J.; Walsh, S. | |
| Journal: | IAU Circ., 7749, 3 (2001). Edited by Green, D. W. E. | |
| Publication Date: | 11/2001 | |
| ^ Top ^ |
| Title: | Supernova 2001el in NGC 1448 | |
| Authors: | Monard, A. G.; Bock, G.; Wassilieff, A.; Biggs, J. | |
| Journal: | IAU Circ., 7720, 1 (2001). Edited by Green, D. W. E. | |
| Publication Date: | 09/2001 | |
| ^ Top ^ |
| Title: | PLANET Observations of Anomalous Microlensing Events | |
| Authors: | Menzies, J.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; Depoy, D. L.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Dominik, M.; Naber, R. M.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | Microlensing 2000: A New Era of Microlensing Astrophysics, ASP Conference Proceedings, Vol. 239. Edited by J. W. Menzies and Penny D. Sackett. San Francisco: Astronomical Society of the Pacific, ISBN: 1-58381-076-5, 2001, p.109 | |
| Publication Date: | 00/2001 | |
| ^ Top ^ |
| Title: | Microlensing Constraints on the Frequency of Jupiter-Mass Planets | |
| Authors: | Gaudi, B. S.; Albrow, M. D.; An, J. H.; Beaulieu, J.-P.; Caldwell, J. A. R.; Depoy, D. L.; Dominik, M.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Pogge, R. W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | Microlensing 2000: A New Era of Microlensing Astrophysics, ASP Conference Proceedings, Vol. 239. Edited by J. W. Menzies and Penny D. Sackett. San Francisco: Astronomical Society of the Pacific, ISBN: 1-58381-076-5, 2001, p.135 | |
| Publication Date: | 00/2001 | |
| Abstract | ||
| Microlensing is the only technique likely, within the next 5 years, to constrain the frequency of Jupiter-analogs. The PLANET collaboration has monitored nearly 100 microlensing events of which more than 20 have sensitivity to the perturbations that would be caused by a Jovian-mass companion to the primary lens. No clear signatures of such planets have been detected. These null results indicate that Jupiter mass planets with separations of 1.5-3 AU occur in less than 1/3 of systems. A similar limit applies to planets of 3 Jupiter masses between 1-4 AU. | ||
| ^ Top ^ | ||
| Title: | Comet C/2000 W1 (Utsunomiya-Jones) | |
| Authors: | Nakano, S.; .Hale, A.; Seargent, D.; Biggs, J.; Urata, T.; Kobayashi, J.; Gilmore, A. C.; Jones, F.; Marsden, B. G. | |
| Journal: | IAU Circ., 7526, 1 (2000). Edited by Green, D. W. E. | |
| Publication Date: | 11/2000 | |
| ^ Top ^ |
| Title: | Comet C/2000 U5 (LINEAR) | |
| Authors: | Ticha, J.; Tichy, M.; Klinglesmith, D. A., III; Ikari, Y.; Biggs, J.; Durig, D. T. | |
| Journal: | IAU Circ., 7515, 1 (2000). Edited by Green, D. W. E. | |
| Publication Date: | 11/2000 | |
| ^ Top ^ |
| Title: | The PLANET Microlensing Collaboration Search for Extrasolar Planets: Status Report (Contributed Talk) | |
| Authors: | Beaulieu, J. P.; Albrow, M.; An, J.; Caldwell, J. A. R.; Depoy, D. L.; Dominik, M.; Gaudi, B. S.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R.; Pogge, R.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A.; | |
| Journal: | Disks, Planetesimals, and Planets, ASP Conference Proceedings, Vol. 219, edited by F. Garzó n, C. Eiroa, D. de Winter, and T. J. Mahoney. Astronomical Society of the Pacific, ISBN 1-58381-051-X, 2000, p.550 | |
| Publication Date: | 00/2000 | |
| ^ Top ^ |
| Title: | Variable Star Research by the PLANET Collaboration | |
| Authors: | Albrow, M. D.; Pollard, K. R.; Beaulieu, J.-P.; Caldwell, J. A. R.; Menzies, J.; Vermaak, P.; Depoy, D. L.; Gaudi, B. S.; Gould, A.; Pogge, R. W.; Dominik, M.; Naber, R. M.; Sackett, P. D.; Greenhill, J.; Hill, K.; Kane, S.; Watson, R.; Martin, R.; Williams, A.; Sahu, K. C.; | |
| Journal: | The Impact of Large-Scale Surveys on Pulsating Star Research, ASP Conference Series, Vol. 203; also IAU Colloquium #176. Edited by L. Szabados and D. Kurtz. ISBN: 1-58381-030-7 (2000), p.25-30 | |
| Publication Date: | 00/2000 | |
| Abstract | ||
| We review the current status and future prospects of the PLANET collaboration, an international team of astronomers performing high-precision photometric monitoring of microlensing events. Our photometric precision and sampling is characterised and the suitability of the database for variable star studies is discussed. Preliminary results on K-giant stability are presented. | ||
| ^ Top ^ | ||
| Title: | Microlensing Constraints on the Frequency of Jupiter Mass Planets | |
| Authors: | Gaudi, B. S.; Albrow, M. D.; Beaulieu, J.-P.; Caldwell, J. A. R.; DePoy, D. L.; Dominik, M.; Gould, A.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pogge, R. W.; Pollard, K. R.; Sackett, P. D.; Sahu, K. C.; Vermaak, P.; Watson, R.; Williams, A. | |
| Journal: | American Astronomical Society, 195th AAS Meeting, #24.04; Bulletin of the American Astronomical Society, Vol. 31, p.1408 | |
| Publication Date: | 12/1999 | |
| Abstract | ||
| Microlensing is the only technique likely, within the next 5 years, to constrain the frequency of Jupiter-analogs. The PLANET collaboration has monitored nearly 100 microlensing events of which more than 20 have sensitivity to the perturbations that would be caused by a Jovian-mass companion to the primary lens. No clear signatures of such planets have been detected. These null results indicate that Jupiter mass planets with separations of 1.5-3 AU occur in less than 1/3 of systems. A similar limit applies to planets of 3 Jupiter masses for separations of 1-4 AU. These are the best limits for extrasolar planets at these separations by any technique. | ||
| ^ Top ^ | ||
| Title: | Supernova 1999ga in NGC 2442 | |
| Authors: | Woodings, S.; Martin, R.; Williams, A.; Biggs, J.; Verveer, A. | |
| Journal: | IAU Circ., 7316, 1 (1999). Edited by Green, D. W. E. | |
| Publication Date: | 11/1999 | |
| ^ Top ^ |
| Title: | Supernova 1999ex in IC 5179 | |
| Authors: | Martin, R.; Williams, A.; Woodings, S.; Biggs, J.; Verveer, A. | |
| Journal: | IAU Circ., 7310, 1 (1999). Edited by Green, D. W. E. | |
| Publication Date: | 11/1999 | |
| ^ Top ^ |
| Title: | Supernova 1999ee in IC 5179 | |
| Authors: | Williams, A.; Biggs, J.; Verveer, A. | |
| Journal: | IAU Circ., 7284, 2 (1999). Edited by Green, D. W. E. | |
| Publication Date: | 10/1999 | |
| ^ Top ^ |
| Title: | Supernova 1999cz in NGC 5078 | |
| Authors: | Williams, A.; Martin, R.; Woodings, S.; Livingston, C.; Biggs, J.; Verveer, A. | |
| Journal: | IAU Circ., 7214, 1 (1999). Edited by Green, D. W. E. | |
| Publication Date: | 07/1999 | |
| ^ Top ^ |
| Title: | Supernova 1999ca in NGC 3120 | |
| Authors: | Woodings, S.; Martin, R.; Williams, A.; Verveer, A.; Biggs, J. | |
| Journal: | IAU Circ., 7158, 1 (1999). Edited by Green, D. W. E. | |
| Publication Date: | 05/1999 | |
| ^ Top ^ |
| Title: | An Astronomical Experience and Abrolhous Odyssey 1999 | |
| Authors: | Kenneally, K.; Coate, K.; Biggs, J. D., eds. | |
| Journal: | Landscope Expedition Report No. 31, CALM, Perth, WA | |
| Publication Date: | 00/1999 | |
| ^ Top ^ |
| Title: | New Moon over the Murchison - Encounters with plants and planets, Burnerbinmah Station 1998 | |
| Authors: | Patrick S.; Biggs, J. D.; Edinger, D., eds. | |
| Journal: | Landscope Expedition Report No. 30, CALM, Perth, WA | |
| Publication Date: | 00/1999 | |
| ^ Top ^ |
| Title: | Supernova 1998ce in MCG -4-24-19 | |
| Authors: | Woodings, S.; Martin, R.; Williams, A.; Biggs, J.; Verveer, A. | |
| Journal: | IAU Circ., 6912, 1 (1998). Edited by Green, D. W. E. | |
| Publication Date: | 05/1998 | |
| ^ Top ^ |
| Title: | Supernova 1998X in NGC 6754 | |
| Authors: | Woodings, S.; Martin, R.; Williams, A.; Patat, F.; della Valle, M. | |
| Journal: | IAU Circ., 6847, 1 (1998). Edited by Green, D. W. E. | |
| Publication Date: | 03/1998 | |
| ^ Top ^ |
| Title: | Supernova 1998E in NGC 5161 | |
| Authors: | Woodings, S.; Martin, R.; Williams, A.; Suntzeff, N.; Ruiz, M.-T. | |
| Journal: | IAU Circ., 6817, 1 (1998). Edited by Green, D. W. E. | |
| Publication Date: | 01/1998 | |
| ^ Top ^ |
| Title: | Supernova 1998A in IC 2627 | |
| Authors: | Williams, A.; .Woodings, S.; Martin, R.; Verveer, A.; Biggs, J. | |
| Journal: | IAU Circ., 6805, 2 (1998). Edited by Green, D. W. E. | |
| Publication Date: | 01/1998 | |
| ^ Top ^ |
| Title: | Under Desert Skies 1997 | |
| Authors: | Biggs, J. D., ed. | |
| Journal: | Landscope Expedition Report No. 25, CALM, Perth, WA | |
| Publication Date: | 00/1998 | |
| ^ Top ^ |
| Title: | A critical view of the night sky: part 2 | |
| Authors: | Biggs, J. D. | |
| Journal: | SCIOS, STAWA, WA, vol 34, p. 18 | |
| Publication Date: | 00/1998 | |
| ^ Top ^ |
| Title: | Solar eclipse safety | |
| Authors: | Lowe, G. S.; Biggs, J. D. | |
| Journal: | SCIOS, STAWA, WA, vol 33, p. 44 | |
| Publication Date: | 00/1998 | |
| ^ Top ^ |
| Title: | A critical view of the night sky: part 1 | |
| Authors: | Biggs, J. D. | |
| Journal: | SCIOS, STAWA, WA, vol 33, p. 15 | |
| Publication Date: | 00/1998 | |
| ^ Top ^ |
| Title: | The Perth Automated Supernova Search | |
| Authors: | Williams, A. J. | |
| Journal: | PhD Thesis - University of Western Australia | |
| Publication Date: | 12/1997 | |
| Keywords: | SUPERNOVAE, STATISTICS | |
| Abstract | ||
| An automated search for supernovae in late spiral galaxies has been established at Perth Observatory, Western Australia. This automated search uses three low-cost PC-clone computers, a liquid nitrogen cooled CCD camera built locally, and a 61-cm telescope automated for the search. The images are all analysed automatically in real-time by routines in Perth Vista, the image processing system ported to the PC architecture for the search system. The telescope control software written for the project, Teljoy, maintains open-loop position accuracy better than 30" of arc after hundreds of jumps over an entire night. Total capital cost to establish and run this supernova search over the seven years of development and operation was around US$30,000. To date, the system has discovered a total of 6 confirmed supernovae, made an independent detection of a seventh, and detected one unconfirmed event assumed to be a supernova. The various software and hardware components of the search system are described in detail, the analysis of the first three years of data is discussed, and results presented. We find a Type Ib/c rate of 0.43 ± 0.43 SNu, and a Type IIP rate of 0.86 ± 0.49 SNu, where SNu are 'supernova units', expressed in supernovae per 1010 solar blue luminosity galaxy per century. These values are for a Hubble constant of 75 km/s per Mpc, and scale as (H0/75)2. The small number of discoveries has left large statistical uncertainties, but our strategy of frequent observations has reduced systematic errors - altering detection threshold or peak supernova luminosity by ± 0.5 mag changes estimated rates by only around 20%. Similarly, adoption of different light curve templates for Type Ia and Type IIP supernovae has a minimal effect on the final statistics (2% and 4% change, respectively). | ||
| ^ Top ^ | ||
| Title: | Save the Premium Bubbly until 2001 | |
| Authors: | Biggs, J. D. | |
| Journal: | Australian Newspaper, p11. | |
| Publication Date: | 1997/8/28 | |
| ^ Top ^ |
| Title: | Supernova 1997Z in NGC 3261 | |
| Authors: | Martin, R.; Williams, A.; Woodings, S.; Benetti, S.; Turatto, M.; Cappellaro, E. | |
| Journal: | IAU Circ., 6558, 1 (1997). Edited by Green, D. W. E. | |
| Publication Date: | 02/1997 | |
| ^ Top ^ |
| Title: | The Planet Collaboration: Probing Lensing Anomalies. | |
| Authors: | Albrow, M.; Beaulieu, J.-P.; Birch, P.; Caldwell, J. A. R.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vreeswiji, P.; Watson, R.; Williams, A.; Zwaan, M. | |
| Journal: | Variables Stars and the Astrophysical Returns of the Microlensing Surveys. Edited by Roger Ferlet, Jean-Pierre Maillard and Brigitte Raban. Cedex, France : Editions Frontieres, 1997., p.135 | |
| Publication Date: | 00/1997 | |
| ^ Top ^ |
| Title: | The PLANET Collaboration: Current Status and Future Prospects | |
| Authors: | Albrow, M.; Beaulieu, J.-P.; van Bemmel, I.; Birch, P.; Caldwell, J. A. R.; Greenhill, J.; Hill, K.; Kane, S.; Martin, R.; Menzies, J.; Naber, R. M.; Pel, J.-W.; Pollard, K.; Sackett, P. D.; Sahu, K. C.; Vreeswijk, P.; Watson, R.; Williams, A.; Zwaan, M. | |
| Journal: | Planets Beyond the Solar System and the Next Generation of Space Missions. Proceedings of a workshop held at Space Telescope Science Institute, Baltimore, MD, October 16-18, 1996. ASP Conference Series, Vol. 119, 1997, ed. David Soderblom (1997), p.91-94 | |
| Publication Date: | 00/1997 | |
| Abstract | ||
| Follow-up observations of gravitational microlensing events is a method by which planetary systems may be detected. This report gives a brief description of the PLANET collaboration and its current research and progress. | ||
| ^ Top ^ | ||
| Title: | Only Time Will Tell | |
| Authors: | Biggs, J. D. | |
| Journal: | Weekend Australian, letters to the editor. | |
| Publication Date: | 1996/12/28 | |
| ^ Top ^ |
| Title: | Supernova 1996N in NGC 1398 | |
| Authors: | Williams, A.; Martin, R.; Germany, L.; Schmidt, B.; Stathakis, R.; Johnston, H. | |
| Journal: | IAU Circ., 6351, 1 (1996). Edited by Green, D. W. E. | |
| Publication Date: | 03/1996 | |
| ^ Top ^ |
| Title: | The PLANET Collaboration | |
| Authors: | Albrow. M.; Birch. P.; Caldwell, J.; Martin, R.; Menzies. J.; Pel. J.; Pollard. K.; Sackett. P.; Sahu. K.; Vreeswijk. P.; Williams. A.; Zwaan. M. | |
| Journal: | Astrophysical applications of gravitational lensing: proceedings of the 173rd Symposium of the International Astronomical Union; held in Melbourne; Australia; 9-14 July; 1995. Edited by C. S. Kochanek and Jacqueline N. Hewitt. International Astronomical Union. Symposium no. 173; Kluwer Academic Publishers; Dordrecht, p.227 | |
| Publication Date: | 00/1996 | |
| ^ Top ^ |
| Title: | The Polarization of the Crab Pulsar with HST | |
| Authors: | Dolan, J. F.;Boyd, P. T.; Hill, R. J.; Graham-Smith, F.; Lyne, A. G.; Biggs, J. D.; Percival, J. W.; Robinson, E. L.; van Citters, G. W. | |
| Journal: | Pulsars: problems and progress, Astronomical Society of the Pacific Conference Series, Vol. 105; Proceedings of the 160th colloquium of the International Astronomical Union held in Sydney; Australia; 8-12 January 1996; San Francisco: Astronomical Society of the Pacific (ASP); |c1996; edited by S. Johnston, M.A. Walker, and M. Bailes., p.301 | |
| Publication Date: | 00/1996 | |
| ^ Top ^ |
| Title: | PLANET (Probing Lensing Anomalies NETwork) | |
| Authors: | Albrow, Michael; Birch, Peter; Caldwell, John A. R.; Martin, Ralph; Menzies, John; Pel, Jan-Willem; Pollard, Karen; Sackett, Penny D.; Sahu, Kailash C.; Vreeswijk, Paul; Williams, Andrew; Zwaan, Martin | |
| Journal: | American Astronomical Society, 187th AAS Meeting, #117.04; Bulletin of the American Astronomical Society, Vol. 27, p.1449 | |
| Publication Date: | 12/1995 | |
| Abstract | ||
| The PLANET (Probing Lensing Anomalies NETwork) collaboration has carried out frequent monitoring of about 7 microlensing events during the 1995 bulge season. The events were monitored in V and I bands, with a typical time interval of about 1.5 to 3 hrs between successive observations of each event. One of the prime objectives of the PLANET collaboration is to look for planets around the lensing objects the signature of which would be sharp extra peaks on the point-source/point-lens microlensing light curve. The data can also be used to look for anomalies caused by other factors such as binary sources/lenses, extended source characteristics, etc. Three 60cm to 1-m class telescopes, situated at La Silla (Chile), Sutherland (South Africa) and Perth (Australia) were used to achieve an almost continuous coverage of the events. The first PLANET campaign lasted about 45 days, starting from 12th July 1995. In principle, such observations are sensitive to the presence of earth-size planets. The data analysis is now in progress. | ||
| ^ Top ^ | ||
| Title: | Obituary - Candy, Michael Philip - 1928-1994 | |
| Authors: | Birch, P.; Biggs, J. | |
| Journal: | R.A.S. QUARTERLY JOURNAL V. 36, NO. 3/SEP, P. 285, 1995 | |
| Publication Date: | 09/1995 | |
| ^ Top ^ |
| Title: | Supernova 1995W in NGC 7650 | |
| Authors: | Williams, A.; Martin, R.; Greenhill, J.; Hill, K. M.; Benetti, S.; Augusteijn, T.; Sarajedini, A. | |
| Journal: | IAU Circ., 6206, 2 (1995). Edited by Marsden, B. G. | |
| Publication Date: | 08/1995 | |
| ^ Top ^ |
| Title: | Was there a K Flash? | |
| Authors: | Woodney, L. M.; A'Hearn, M. F.; Meier, R.; Wellnitz, D.; Smith, T.; Verveer, A.; Martin, R. | |
| Journal: | American Astronomical Society, DPS Meeting #27, #20.17; Bulletin of the American Astronomical Society, Vol. 27, p.1115 | |
| Publication Date: | 06/1995 | |
| ^ Top ^ |
| Title: | Multisite, multicolour observations of Theta Tucanae | |
| Authors: | Paparo, M.; Sterken, C.; Spoon, H.; Birch, P.; Candy, M.; Crake, P. | |
| Journal: | Delta Scuti Star Newsletter, Issue 8, p. 10-13. | |
| Publication Date: | 01/1995 | |
| Abstract | ||
| Theta Tuc (HR 139) was first discovered to be a variable star by Cousins & Largerwey (MNRASSA 30, 12, 1971). The period of light variation was in the range 70-80 min., and the amplitude was found to be variable with a maximum in V light of 0.06 mag typical of Delta Scuti type variability. Later, two independent data sets (556 integrations on six nights in 1972 and 954 observations obtained during 70 hours on 21 nights in 1979) were published and analysed by Stobie & Shobbrook (MNRAS 174, 401, 1976) and Kurtz (MNRAS 193, 61, 1980), respectively. The two independent analyses led to two alternative hypotheses: the first is that the frequencies present in the light curve of Theta Tuc are unstable and may change in a time span as short as 24 hours, the second is that all frequencies in Theta Tuc are completely stable, but that beating among the various frequencies makes them appear to come and go. No definite frequency solution, but only a possible set of frequencies were given. | ||
| ^ Top ^ | ||
| Title: | Were Any Impact Flashes Seen in Reflection from the Satellites? | |
| Authors: | A'Hearn, M. F.; Meier, R.; Wellnitz, D.; Woodney, L.; Martin, R.; Smith, T.; Verveer, A. | |
| Journal: | Proceedings of the European Shoemaker-Levy 9 Conference, held 13-15 February, 1995 in Garching bei München, Germany. Edited by R. West and H. Bö hnhardt. ESO Conference and Workshop Proceedings No. 52, 1995., p.113 | |
| Publication Date: | 00/1995 | |
| ^ Top ^ |
| Title: | A Search for a Pulsar in the Remnant of SN1987A with the High Speed Photometer | |
| Authors: | Dolan, J. F.; Percival, J. W.; Boyd, P. T.; Biggs, J. D.; Bless, R. C.; Elliot, J. L.; Nelson, M. J.; Robinson, E. L.; Taylor, M. J.; van Citters, G. W.; Wolinski, K. G. | |
| Journal: | American Astronomical Society, 185th AAS Meeting, #62.04; Bulletin of the American Astronomical Society, Vol. 26, p.1416 | |
| Publication Date: | 12/1994 | |
| Abstract | ||
| The High Speed Photometer on the Hubble Space Telescope observed the remnant of SN1987A on four different epochs between 1992 June 2 and 1993 November 4 in a 1600 - 7000 Å bandpass. Each observation was approximately 40 minutes in duration and used a 100 microsecond sampling time. After correcting to the barycenter of the solar system, no periodic signal was found in any data set using autocorrelation function (ACF) analyses with lags from 200 microseconds to 10 s, power spectral function (PSF) analyses with a Nyquist frequency corresponding to a period of 200 microseconds, or in trial pulse profiles obtained by binning the data modulo the frequencies of highest significance in the ACF and PSF analyses. Searches for signals with large values of dp/dt also proved negative. We estimate an upper limit of V fainter than 27 for pulsed radiation from any stellar remnant of SN1987A. | ||
| ^ Top ^ | ||
| Title: | The Comet Impact Network Experiment (CINE) | |
| Authors: | Larson, S.; Scotti, J.; Howell, E.; Marcialis, R.; Nolan, M.; Wisniewski, W.; A'Hearn, M.; Wellnitz, D.; Campins, H.; Rabinowitz, D.; Butner, H.; Tapia, S.; Vilas, F.; Doherty, P.; Bessell, M.; Brosch, N.; Liebowitz, E.; Gilmore, A.; Kervin, P.; Africano, J.; Levine, S.; Schuster, W.; Martin, R.; Verveer, A.; Moreno, F.; Molina, A.; Rutten, R.; Kidger, M. | |
| Journal: | American Astronomical Society, DPS Meeting #26, Shoemaker-Levy Program, #01.26-P; Bulleting of the American Astronomical Society, Vol. 26, p. 1570 | |
| Publication Date: | 06/1994 | |
| ^ Top ^ |
| Title: | Periodic Comet Kushida (1994a) | |
| Authors: | Verveer, A.; Smith, T.; Casulli, V. S.; Valentini, S. | |
| Journal: | IAU Circ., 5922, 1 (1994). Edited by Green, D. W. E. | |
| Publication Date: | 01/1994 | |
| ^ Top ^ |
| Title: | C2, CN and dust in Comet Wilson (1987VII) | |
| Authors: | Schulz, R.; Ahearn, M. F.; Birch, P. V.; Bowers, C.; Kempin, M.; Martin, R. | |
| Journal: | In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1261-1262 (SEE N94-20636 05-91) | |
| Publication Date: | 03/1993 | |
| Keywords: | CARBON, COMETARY ATMOSPHERES, COMETS, CYANIDES, RADIAL DISTRIBUTION, CHEMICAL COMPOSITION, DUST, EMISSION SPECTRA | |
| Abstract | ||
| Column density profiles in C2 and CN as well as in blue and red continuum (BC and RC) were constructed from two dimensional images of the coma of Comet Wilson (1987VII). The authors' analysis showed that the continuum profiles decrease with the nuclear distance rho as 1/rho. From the C2 and CN profiles the authors determined the parent and the daughter lifetimes as well as the production rates in terms of the vectorial model. | ||
| ^ Top ^ | ||
| Title: | Supernova 1993K in NGC 2223 | |
| Authors: | Williams, A.; Martin, R.; Schmidtke, P. C.; Phillips, M. M.; Maza, J.; Wischnjewsky, M. | |
| Journal: | IAU Circ., 5733, 1 (1993). Edited by Marsden, B. G. | |
| Publication Date: | 03/1993 | |
| ^ Top ^ |
| Title: | Periodic Comet Forbes (1993f) | |
| Authors: | Candy, M. P.; Lowe, G. | |
| Journal: | IAU Circ., 5728, 1 (1993). Edited by Marsden, B. G. | |
| Publication Date: | 03/1993 | |
| ^ Top ^ |
| Title: | Comet Bradfield (1992i) | |
| Authors: | Herald, D.; Candy, M. P.; Marsden, B. G.; Lowe, G.; C.Gilmore, A. C.; Kilmartin, P. M. | |
| Journal: | IAU Circ., 5530, 1 (1992). Edited by Green, D. W. E. | |
| Publication Date: | 05/1992 | |
| ^ Top ^ |
| Title: | Automatic Direct Imaging and Photometric Telescopes in Australia | |
| Authors: | Carter, B. D.; Bernbrick, C.; Moore, K. G.; Zealey, W.; Blair, D. G.; Burman, T.; Williams, A.; Tsang, C. P.; Evans, M.; Lynch, M. J.; Zadnik, M.; Forster, D.; Dai, X.; Koch, R.; Candy, M.; Birch, P.; Martin, R.; Verveer, A.; Coates, D. W.; Thompson, K.; Stewart, R. T.; Jones, K. L.; O'Mara, B. J.; Page, A. A.; Ross, J. E.; Avery, H. P.; Mottram, K. | |
| Journal: | Automated Telescopes for Photometry and Imaging, ASP Conference Series, Vol. 28, 1992, S.J. Adelman, R.J. Dukes, Jr.; and C.J. Adelman, Eds., p. 135. | |
| Publication Date: | 00/1992 | |
| ^ Top ^ |
| Title: | Comet MRKOS (1991k) | |
| Authors: | .Mrkos, A.; Helin, E.; Ceplecha, Z.; Lawrence, K.; Rose, P.; McNaught, R. H.; Lowe, G.; Candy, M. P. | |
| Journal: | IAU Circ., 5212, 1 (1991). Edited by Green, D. W. E. | |
| Publication Date: | 03/1991 | |
| ^ Top ^ |
| Title: | Supernova 1990M in NGC 5493 | |
| Authors: | Sonneborn, G.; Kirshner, R.; della Valle, M.; Leisy, P.; Horine, E.; Benetti, S.; Turatto, M.; Cappellaro, E.; Bond, H.; Candy, M. P.; Hale, A. | |
| Journal: | IAU Circ., 5034, 1 (1990). Edited by Green, D. W. E. | |
| Publication Date: | 06/1990 | |
| ^ Top ^ |
| Title: | Contemporary b,y Photometry and Methane-Band Spectrophotometry of Neptune in 1990: Evidence for Post-Encounter Cloud Evolution | |
| Authors: | Lockwood, G. W.; Thompson, D. T.; Hammel, H. B.; Birch, P.; Candy, M. | |
| Journal: | Bulletin of the American Astronomical Society, Vol. 22, p.1106 | |
| Publication Date: | 06/1990 | |
| ^ Top ^ |
| Title: | Automated Image Acquisition and Analysis with a Small Teleswcope | |
| Authors: | Koch, R.; Dai, X.; Lynch, M. J.; Rye, P. J.; Zadnik, M.; Martin, R.; Verveer, A.; Candy, M.; Birch, P.; Blair, D. G.; Burman, R. R. and Williams, A. | |
| Journal: | Proceedings: Image Processing and the Impact of New Technologies, Canberra, ACT, December 18-20, 1989. IREE Australia, p. 287. | |
| Publication Date: | 00/1990 | |
| ^ Top ^ |
| Title: | The Variability of Comet Halley During the 1985/1986 Apparition | |
| Authors: | Schleicher, D. G.; Millis, R. L.; Tholen, D. J.; Hammel, H. B.; Piscitelli, J. R.; Lark, N.; Birch, P. V.; Martin, R. | |
| Journal: | Bulletin of the American Astronomical Society, Vol. 19, p.879 | |
| Publication Date: | 06/1987 | |
| ^ Top ^ |
| Title: | Production of Gas and Dust by Comet Halley | |
| Authors: | Millis, R. L.; Schleicher, D. G.; Birch, P. V.; Martin, R.; A'Hearn, M. F. | |
| Journal: | Bulletin of the American Astronomical Society, Vol. 19, p.880 | |
| Publication Date: | 06/1987 | |
| ^ Top ^ |
| Title: | Nova Centauri 1986 | |
| Authors: | Birch, P.; Martin, R.; Seargent, D.; McNaught, R. H. | |
| Journal: | IAU Circ., 4278, 2 (1986). Edited by Marsden, B. G. | |
| Publication Date: | 12/1986 | |
| ^ Top ^ |
| Title: | The variability of Halley's Comet during the Vega, Planet-A, and Giotto encounters | |
| Authors: | Schleicher, D. G.; Millis, R. L.; Tholen, D.; Lark, N.; Birch, Peter V.; Martin, Ralph; Ahearn, Michael F. | |
| Journal: | In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p. 565-567 | |
| Publication Date: | 12/1986 | |
| Keywords: | HALLEY'S COMET, SPACE OBSERVATIONS (FROM EARTH), SPECTROPHOTOMETRY, VARIABILITY, EMISSION SPECTRA, FLYBY MISSIONS, MOLECULAR SPECTROSCOPY | |
| Abstract | ||
| Narrowband photometry of Halley obtained at Cerro Tololo Inter-American Observatory (CTIO), Mauna Kea Observatory (MKO), and Perth Observatory was combined to determine the relative level of activity during the interval spanning the spacecraft encounters. Measurements of the flux from the comet in emission bands of OH, NH, CN, C3, and C2, as well as at 2 continuum points, were obtained at CTIO on each night between 5 March and 17 March 1986. Observations were made on many of these same dates at MKO and Perth using comparable interference filters. The date clearly show variation of a factor of 2.5 in the production of all observed species with a characteristic time scale of a few days. | ||
| ^ Top ^ | ||
| Title: | Ion morphology in the inner tail of Comet P/Halley | |
| Authors: | Hoban, Susan; Ahearn, Michael F.; Birch, Peter V.; Candy, Michael P.; Martin, Ralph; Klinglesmith, Daniel A., III | |
| Journal: | In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p. 505-506 | |
| Publication Date: | 12/1986 | |
| Keywords: | COMET TAILS, HALLEY'S COMET, MOLECULAR IONS, CARBON MONOXIDE, EMISSION SPECTRA, RATIOS, WATER | |
| Abstract | ||
| Comet Halley CCD images taken in the light of CO(+) and H2O(+) were analyzed. Most of the ionic emission originates in a diffuse component on which the ion ray structure appears to be superimposed. On average, the peak enhancement in the CO(+) rays is 20% over the adjacent minima, where the emission is due to the underlying component. The H2O(+):CO(+) ratio varies by as much as 30% from ray to ray. | ||
| ^ Top ^ | ||
| Title: | Gaseous jets in Comet P/Halley | |
| Authors: | A'hearn, Michael F.; Hoban, Susan; Birch, Peter V.; Bowers, Craig; Martin, Ralph; Klinglesmith, Daniel A., III | |
| Journal: | In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p. 483-486 (SEE N87-25141 18-90) | |
| Publication Date: | 12/1986 | |
| Keywords: | COMETARY ATMOSPHERES, GAS JETS, HALLEY'S COMET, RADICALS, COSMIC DUST, SPACE OBSERVATIONS (FROM EARTH), SPECTROPHOTOMETRY | |
| Abstract | ||
| Properties of the gas jets in P/Halley reported to exist in images taken in the light of CN are described. The jets also exist in the light of other radicals, specifically C2. The jets do not exist in the continuum images although it appears that one of the jets seen may come from the same area on the nucleus that produces much of the dust. The jets are seen to persist, although with varying geometry, for 2 months or more, from the time of the spacecraft encounters in March to the beginning of May. The strength of the jets is well correlated with fluctuations in the overall production rate of radicals by the comet. | ||
| ^ Top ^ | ||
| Title: | Nova MUSCAE 1983 | |
| Authors: | Nikoloff, I.; Birch, P.; Harwood, D.; Whitelock, P. A.; Laney, D. | |
| Journal: | IAU Circ., 3771, 1 (1983). Edited by Marsden, B. G. | |
| Publication Date: | 02/1983 | |
| ^ Top ^ |
| Title: | Perth 75 Catalogue | |
| Authors: | Nikoloff, I.; + | |
| Journal: | Published in: Bickley W. Australia, Perth Observatory (1982) | |
| Publication Date: | 00/1982 | |
| Keywords: | Positional data, Proper motions, Meridian observations, Stars: fundamental | |
| Abstract | ||
| The catalog contains results of approximately 60000 photoelectric meridian circle observations made at the Perth Observatory for 1156 FK4 and 1433 FK4 Supplement stars south of declination +38 degrees. The catalog reports proper motions and positions at epoch and equinox B1950.0. The data used to derive the epoch 1950 positions are included in the catalog so that originally observed positions may be recomputed and used for geodetic purposes until the FK5 becomes available. The mean error of an individual position in this catalog is 0.07" in right ascension and 0.13" in declination at a zenith distance of 45 degrees, while the mean error of the PERTH 75 system is 0.05" in right ascension and 0.10" in declination. The positions do not contain the large systematic errors of the FK4 (Fricke and Kopff 1963), which can be, for example 0.3" in right ascension for declination < -75 degrees. Data in the catalog included FK4 (FK4S) number, observed visual magnitude, spectral type used for computing refraction, right ascension and declination (equinox and epoch B1950.0), annual proper motion, observed residuals, numbers of accepted observations, and code to indicate if parallax and/or radial velocity has been used in computing apparent positions. | ||
| Title: | Simultaneous X-ray, ultraviolet, optical, and radio observations of the flare star Proxima Centauri | |
| Authors: | Haisch, B. M.; Slee, O. B.; Siegman, B. C.; Nikoloff, I.; Candy, M.; Harwood, D.; Verveer, A.; Quinn, P. J.; Wilson, I.; Linsky, J. L. | |
| Journal: | Astrophysical Journal, Part 1, vol. 245, May 1, 1981, p. 1009-1017. | |
| Publication Date: | 05/1981 | |
| Keywords: | FLARE STARS, RADIO SOURCES (ASTRONOMY), STELLAR RADIATION, STELLAR SPECTROPHOTOMETRY, ULTRAVIOLET ASTRONOMY, VARIABLE STARS, X RAY SOURCES, CHROMOSPHERE, ELECTRON DENSITY (CONCENTRATION), HEAO, IUE, STELLAR ATMOSPHERES, STELLAR CORONAS, STELLAR SPECTRA | |
| DOI: | 10.1086/158878 | |
| ^ Top ^ |
| Title: | Comet Seargent (1978m) | |
| Authors: | Seargent, D. A. J.; Herald, D.; Verveer, A.; Candy, M. P. | |
| Journal: | IAU Circ., 3277, 1 (1978). Edited by Marsden, B. G. | |
| Publication Date: | 10/1978 | |
| ^ Top ^ |
| Title: | Periodic Comet Chernykh (1977l) | |
| Authors: | Bruwer, J. A.; Torres, C.; Barros, S.; Wischnjewsky, M.; C.Gilmore, A. C.; Kilmartin, P. M.; Candy, M. P.; Verveer, A.; Chernykh, N. S.; Marsden, B. G. | |
| Journal: | IAU Circ., 3236, 2 (1978). Edited by Marsden, B. G. | |
| Publication Date: | 06/1978 | |
| ^ Top ^ |
| Title: | Comet Bradfield (1978c) | |
| Authors: | Verveer, A.; Jekabsons, P.; Johnson, J.; Candy, M. P.; Torres, C.; Wischnjewsky, M.; Marsden, B. G. | |
| Journal: | IAU Circ., 3233, 2 (1978). Edited by Marsden, B. G. | |
| Publication Date: | 06/1978 | |
| ^ Top ^ |
| Title: | Periodic Comet Arend-Rigaux (1977k) | |
| Authors: | C.Gilmore, A. C.; Kilmartin, P. M.; Candy, M. P.; Verveer, A.; Natori, A. | |
| Journal: | IAU Circ., 3232, 3 (1978). Edited by Marsden, B. G. | |
| Publication Date: | 06/1978 | |
| ^ Top ^ |
| Title: | Comet Kohler (1977m) | |
| Authors: | Gressmann, M.; Torres, C.; Wischnjewsky, M.; Barros, S.; C.Gilmore, A. C.; Kilmartin, P. M.; Bruwer, J. A.; Candy, M. P.; Verveer, A.; Johnson, J.; Natori, A. | |
| Journal: | IAU Circ., 3229, 4 (1978). Edited by Marsden, B. G. | |
| Publication Date: | 06/1978 | |
| ^ Top ^ |
| Title: | Comet Bradfield (1978c) | |
| Authors: | Johnson, J.; Candy, M. P.; Verveer, A. | |
| Journal: | IAU Circ., 3177, 1 (1978). Edited by Marsden, B. G. | |
| Publication Date: | 02/1978 | |
| ^ Top ^ |
| Title: | Periodic Comet Encke | |
| Authors: | Jekabsons, P.; Candy, M. P.; Gans, D. J.; Verveer, A.; .Schuster, H.-E.; Sekanina, Z. | |
| Journal: | IAU Circ., 3139, 2 (1977). Edited by Marsden, B. G. | |
| Publication Date: | 11/1977 | |
| ^ Top ^ |
| Title: | Comet Kohler (1977m) | |
| Authors: | Moore, E.; Jarratt, R.; Ferreri, W.; Zappala, V.; .Mrkos, A.; Vavrova, Z.; Candy, M. P.; Verveer, A.; Tsuchiya, K.; .Takeishi, M.; Herald, D.; Furuta, T.; Seki, T.; Manning, B.; Birtwhistle, P.; Giclas, H. L.; Kantz, M. L. | |
| Journal: | IAU Circ., 3132, 2 (1977). Edited by Marsden, B. G. | |
| Publication Date: | 11/1977 | |
| ^ Top ^ |
| Title: | Periodic Comet Chernykh (1977l) | |
| Authors: | Candy, M. P.; Verveer, A.; .Mrkos, A.; Vavrova, A.; Shao, C.-Y.; Bulger, J. H.; Giclas, H. L.; Kantz, M. L.; Furuta, T.; Seki, T.; Tsuchiya, K.; Urata, M.; Takeishi, T.; Bortle, J.; Marsden, B. G. | |
| Journal: | IAU Circ., 3128, 2 (1977). Edited by Marsden, B. G. | |
| Publication Date: | 11/1977 | |
| ^ Top ^ |
| Title: | Periodic Comet d'Arrest (1976e) | |
| Authors: | Jekabsons, C.; Jekabsons, P.; Candy, M. P.; Harwood, D.; Helin, E.; Bus, S. J.; Waterfield, R. L.; Purcell, I. M.; Rutter, G. H.; Codina, J. M.; Torras, N.; Giclas, H. L.; Kantz, N. L.; Moore, G. K. G.; Sekanina, Z.; Debehogne, H.; Surdej, J.; Surdej, A.; Simmons, K.; Meisel, D. D.; Maley, P. | |
| Journal: | IAU Circ., 2990, 1 (1976). Edited by Marsden, B. G. | |
| Publication Date: | 09/1976 | |
| ^ Top ^ |
| Title: | Comet Kobayashi-Berger-Milon (1975h) | |
| Authors: | Jekabsons, P.; Jekabsons, C.; Candy, M. P.; .Harwood, D.; .de Vegt, C.; Gehlich, K. U.; Kleine, T. | |
| Journal: | IAU Circ., 2968, 1 (1976). Edited by Marsden, B. G. | |
| Publication Date: | 07/1976 | |
| ^ Top ^ |
| Title: | Comet Lovas (1974c) | |
| Authors: | Gans, D.; Jekabsons, P.; Candy, M. P.; Harwood, D. | |
| Journal: | IAU Circ., 2963, 3 (1976). Edited by Marsden, B. G. | |
| Publication Date: | 06/1976 | |
| ^ Top ^ |
| Title: | Comet Bradfield (1976a) | |
| Authors: | Austin, R. R. D.; C.Gilmore, A. C.; Kilmartin, P. M.; Candy, M. P.; Jekabsons, P.; Harwood, D.; Guth, V.; Armstrong, J.; Sumner, B.; Hale, A.; Mikolas, J.; Bortle, J.; Simmons, K. | |
| Journal: | IAU Circ., 2933, 1 (1976). Edited by Marsden, B. G. | |
| Publication Date: | 03/1976 | |
| ^ Top ^ |
| Title: | Periodic Comet Faye (1969a) | |
| Authors: | Antal, M.; Pajdusakova, L.; Harwood, D.; Harris, B. J.; Petrovicova, R.; Mrkos, A.;Mohr, J. M.; Milet, B. | |
| Journal: | IAU Circ., 2215, 4 (1970). Edited by Marsden, B. G. | |
| Publication Date: | 02/1970 | |
| ^ Top ^ |
| Title: | Comet Fujikawa (1969d) | |
| Authors: | Nikoloff, I.; Candy, M. P. | |
| Journal: | IAU Circ., 2215, 3 (1970). Edited by Marsden, B. G. | |
| Publication Date: | 02/1970 | |
| ^ Top ^ |
| Title: | Periodic Comet Comas SOLA (1968g) | |
| Authors: | Harris, B. J.; Nikoloff, I.; Milet, B.; Seki, T. | |
| Journal: | IAU Circ., 2212, 2 (1970). Edited by Marsden, B. G. | |
| Publication Date: | 02/1970 | |
| ^ Top ^ |
| Title: | Comet Tago-Sato-Kosaka (1969g) | |
| Authors: | Andruszkiw, I.; Harris, B. J.; Candy, M. P.; Nikoloff, I.; Gans, D.; Harwood, D.; Seki, T.; Milet, B. | |
| Journal: | IAU Circ., 2208, 2 (1970). Edited by Marsden, B. G. | |
| Publication Date: | 02/1970 | |
| ^ Top ^ |
| Title: | Comet Bennett (1969i) | |
| Authors: | Torres, C.; Wroblewski, H.; Wischniewsky, M.; Barros, S.; Potter, H.; Lokalov, A.; Candy, M. P.; Nikoloff, I.; Gans, D.; Harwood, D.; Andruszkiw, I. | |
| Journal: | IAU Circ., 2207, 1 (1970). Edited by Marsden, B. G. | |
| Publication Date: | 02/1970 | |
| ^ Top ^ |
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