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New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
S. O. Kepler, Ingrid Pelisoli, Detlev Koester +11
We report the discovery of 9 089 new spectroscopically confirmed white dwarfs and subdwarfs in the Sloan Digital Sky Survey Data Release 10. We obtain Teff, log g and mass for hydr…
Variable Emission from a Gaseous Disc around a Metal-Polluted White Dwarf
David J Wilson, Boris Gaensicke, Detlev Koester +4
We present the discovery of strongly variable emission lines from a gaseous disc around the DA white dwarf SDSS J1617+1620, a star previously found to have an infrared excess indic…
On Thermohaline Mixing in Accreting White Dwarfs
Detlev Koester
We discuss the recent claim that the thermohaline ("fingering") instability is important in accreting white dwarfs, increasing the derived accretion fluxes potentially by orders of…
Atmospheric parameters and carbon abundance for hot DB white dwarfs
Detlev Koester, Judi Provencal, Boris T. Gänsicke
Atmospheric parameters for hot DB (helium atmosphere) white dwarfs near effective temperatures of 25000K are extremely difficult to determine from optical spectroscopy. This is par…
The frequency of planetary debris around young white dwarfs
Detlev Koester, Boris T. Gänsicke, Jay Farihi
(Abridged) We present the results of the first unbiased survey for metal pollution among H-atmosphere (DA) white dwarfs with cooling ages of 20-200 Myr and 17000K < Teff < 27000K,…
Component masses of young, wide, non-magnetic white dwarf binaries in the SDSS DR7
R. B. Baxter, P. D. Dobbie, Q. A. Parker +7
We present a spectroscopic component analysis of 18 candidate young, wide, non-magnetic, double-degenerate binaries identified from a search of the Sloan Digital Sky Survey Data Re…