Searching for White Dwarfs in Surveys

Details Searching for White Dwarfs in Surveys Searching for White Dwarfs in Surveys

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..44k&link_type=abstract

Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech

Astronomy and Astrophysics

Astronomy

Scientific paper

Proper-motion, optical and ultraviolet surveys offer valuable data to search for white dwarfs within the Galaxy. The New Luyten Two-Tenths (NLTT) catalog has been a rich source for finding new nearby objects, however many objects still require spectroscopic identification. We have used the Revised-NLTT (rNLTT) catalog of Salim & Gould (2003) to search for new nearby white dwarfs. Making use of a Reduced-Proper Motion diagram and optical-infrared photometry we have identified over 400 white dwarf candidates, out of which only half of these have been spectroscopically confirmed. We have also begun a search for faint white dwarfs using the Sloan Digital Sky Survey (SDSS) and Galaxy Evolution Explorer. We have used the 2dF QSO Redshift Survey (2QZ) white dwarf catalog as a base to investigate the photometric properties of white dwarfs in the ultraviolet (GALEX) and optical (SDSS). We will build a white dwarf luminosity function, update the mass density of white dwarfs in the Solar neighbourhood. We will also search for white dwarfs with peculiar properties and motion. For example, LP 400-22 which is a high-proper motion star was found to be a very low mass white dwarf with a space velocity of over 400 km/s (Kawka et al. 2006).

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