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White Dwarfs in the GALEX SurveyWe have cross-correlated the 2dF QSO Redshift Survey (2QZ) white dwarf catalog with the GALEX 2nd Data Release and the Sloan Digital Sky Survey (SDSS) data release 5 to obtain ultraviolet photometry (FUV, NUV) for approximately 700 objects and optical photometry (ugriz) for approximately 800 objects. We have compared the optical-ultraviolet colors to synthetic white dwarf colors to obtain temperature estimates for approximately 250 of these objects. These white dwarfs have effective temperatures ranging from 10 000 K (cooling age of about 1Gyr) up to about 40000 K (cooling age of about 3 Myrs), with a few that have even higher temperatures. We found that to distinguish white dwarfs from other stellar luminosity classes both optical and ultraviolet colors are necessary, in particular for the hotter objects where there is contamination from B and 0 main-sequence stars. Using this sample we build a luminosity function for the DA white dwarfs with Mv < 12 mag.
Document ID
20070021232
Acquisition Source
Goddard Space Flight Center
Document Type
Other
Authors
Kawka, Adela
(Ceskoslovenska Akademie Ved Ondrejov, Czechoslovakia)
Vennes, Stephane
(Florida Inst. of Tech. Melbourne, FL, United States)
Date Acquired
August 23, 2013
Publication Date
February 15, 2007
Subject Category
Astronomy
Report/Patent Number
astro-ph/0702420v1
Distribution Limits
Public
Copyright
Other

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