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The Discovery of a Debris Disk Around the DAV White Dwarf PG 1541+651
Mukremin Kilic, Adam J. Patterson, Sara Barber +2
To search for circumstellar disks around evolved stars, we targeted roughly 100 DA white dwarfs from the Palomar Green survey with the Peters Automated Infrared Imaging Telescope (…
Stars with Unusual Compositions: Carbon and Oxygen in Cool White Dwarf Stars
P. Dufour
I present a broad historical review on cool white dwarf stars with carbon and/or oxygen detected at the photosphere. This book chapter covers the observational signatures, physical…
A Comprehensive Spectroscopic Analysis of DB White Dwarfs
P. Bergeron, F. Wesemael, Pierre Dufour +9
We present a detailed analysis of 108 helium-line (DB) white dwarfs based on model atmosphere fits to high signal-to-noise optical spectroscopy. We derive a mean mass of 0.67 Mo fo…
Taking Advantage of the COS Time-Tag Capability: Observations of Pulsating Hot DQ White Dwarfs and Discovery of a New One
P. Dufour, S. Béland, G. Fontaine +2
We present an analysis of the ultraviolet light curves of five Hot DQ white dwarfs recently observed with the Cosmic Origins Spectrograph (COS) on board the Hubble Space Telescope…