White Dwarfs in the GALEX Survey

Details White Dwarfs in the GALEX Survey White Dwarfs in the GALEX Survey

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...4e..25k&link_type=abstract

The Ultraviolet Universe: Stars from Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August 2006, Prague, Cze

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Scientific paper

We 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 4 to obtain ultraviolet photometry (FUV,NUV) for approximately 700 objects and optical photometry (ugriz) for approximately 800 objects. We have compared the optical-ultraviolet colours to synthetic white dwarf colours to obtain temperature estimates for approximately 250 of these objects. These white dwarfs have effective temperatures ranging from 10000 K (cooling age of about 1 Gyr) up to about 40000 K (cooling age of about 3 Myrs), with a few that have even higher temperatures. We have found that to distinguish white dwarfs from other stellar luminosity classes both optical and ultraviolet colours are necessary, in particular for the hotter objects where there is contamination from B and O main-sequence stars. Using this sample of white dwarfs we will determine the fraction of helium-rich white dwarfs (DO,DB) relative to hydrogen-rich white dwarfs (DA), and make luminosity functions for both hot DA and DO white dwarfs. The temperatures of the 2QZ white dwarfs obtained from the UV colours will be used to obtain luminosities of the objects and hence their distance. From this we will be able to determine the scale height of these stars.

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