White Dwarf Mass Distribution in the SDSS

Details White Dwarf Mass Distribution in the SDSS White Dwarf Mass Distribution in the SDSS

2006-12-11

arxiv.org/abs/astro-ph/0612277v2

Mon.Not.Roy.Astron.Soc.375:1315-1324,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the MNRAS, 27 pages, 14 figures and 6 tables. Corrected sky coverage area and densities

Scientific paper

10.1111/j.1365-2966.2006.11388.x

We determined masses for the 7167 DA and 507 DB white dwarf stars classified as single and non-magnetic in data release four of the Sloan Digital Sky Survey (SDSS). We obtained revised Teff and log g determinations for the most massive stars by fitting the SDSS optical spectra with a synthetic spectra grid derived from model atmospheres extending to log g=10.0. We also calculate radii from evolutionary models and create volume-corrected mass distributions for our DA and DB samples. The mean mass for the DA stars brighter than g=19 and hotter than Teff=12000K is M(DA)= 0.593+/-0.016M(Sun). For the 150 DBs brighter than g=19 and hotter than Teff=16000K, we find M(DB)=0.711+/-0.009 M(Sun). It appears the mean mass for DB white dwarf stars may be significantly larger than that for DAs. We also report the highest mass white dwarf stars ever found, up to 1.33 M(Sun).

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