Hot DO and DB White Dwarfs from the Sloan Digital Sky Survey

Details Hot DO and DB White Dwarfs from the Sloan Digital Sky Survey Hot DO and DB White Dwarfs from the Sloan Digital Sky Survey

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..391..227l&link_type=abstract

Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, at Eberhard

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Scientific paper

Hot DB and DO stars found in the Sloan Digital Sky Survey are analyzed. We note first that the mass distribution of DB stars determined by others has a very similar mean to that for samples of DA stars, but lacks low and high mass outliers. Our working hypothesis is that the missing high mass DB stars may simply be observed as hot DQ white dwarfs. The recent discovery of DB stars in the alleged ``DB gap'' at 30,000 - 45,000 K is discussed. Temperatures are estimated from both fits to the spectra and to the energy distributions. A deficit of stars in this range still seems likely, which would imply that about 10% of DA evolve into DB stars below 30,000 K. We are working towards a preliminary luminosity function of DO-DB white dwarfs.

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