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Cool White Dwarfs Identified in the Second Data Release of the UKIRT Infrared Deep Sky Survey
N. Lodieu, S. K. Leggett, P. Bergeron +1
We have paired the Second Data Release of the Large Area Survey of the UKIRT Infrared Deep Sky Survey with the Fifth Data Release of the Sloan Digital Sky Survey to identify ten co…
The "DODO" survey I: limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa 2)
M. R. Burleigh, F. J. Clarke, E. Hogan +8
We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North…
A Comparative Study of Optical and Ultraviolet Effective Temperatures for DA White Dwarfs from the IUE Archive
C. -P. Lajoie, P. Bergeron
We present a comparative study of effective temperatures determined from the hydrogen Balmer lines and from the UV energy distribution for 140 DA white dwarfs drawn from the IUE ar…
Stellar Evolution in NGC 6791: Mass Loss on the Red Giant Branch and the Formation of Low Mass White Dwarfs
Jasonjot S. Kalirai, P. Bergeron, Brad M. S. Hansen +4
We present the first detailed study of the properties (temperatures, gravities, and masses) of the NGC 6791 white dwarf population. This unique stellar system is both one of the ol…
Evidence for a merger of binary white dwarfs: the case of GD 362
E. Garcia-Berro, P. Loren-Aguilar, A. G. Pedemonte +4
GD 362 is a massive white dwarf with a spectrum suggesting a H-rich atmosphere which also shows very high abundances of Ca, Mg, Fe and other metals. However, for pure H-atmospheres…
The Unusual Binary Pulsar PSR J1744-3922: Radio Flux Variability, Near-infrared Observation and Evolution
R. P. Breton, M. S. E. Roberts, S. M. Ransom +4
PSR J1744-3922 is a binary pulsar exhibiting highly variable pulsed radio emission. We report on a statistical multi-frequency study of the pulsed radio flux variability which sugg…