The White Dwarf Mass Distribution

Details The White Dwarf Mass Distribution The White Dwarf Mass Distribution

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372...35k&link_type=abstract

15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in

Astronomy and Astrophysics

Astronomy

3

Scientific paper

Studying the 7755 single non-magnetic DA white dwarfs discovered by the Sloan Digital Survey we determined their Teff and log g. We find a handful of stars whose Sloan optical spectra, when compared to Koester's model atmosphere grid up to log g=10 and Althaus' evolutionary models, indicate masses above 1.3 M_&sun;. We report here on the mass distribution. The mean mass for the stars brighter than g=19 and hotter than Teff=12 000 K, _DA≃ 0.593± 0.016 {{M}}_&sun;. We also determined the masses for the 616 single DBs in the DR4 sample. For the 166 DBs brighter than g=19 and hotter than Teff=16 000 K, we find _DB=0.683± 0.008 {{M}}_&sun;. It appears the mean mass for DB white dwarf stars is larger than that for DAs.

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