Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372...49c&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
1
Scientific paper
We present a new catalogue of masses, radii and bolometric luminosities for hot DA white dwarfs observed by the Sloan Digital Sky Survey (Data Release 4). Masses and radii of 7134 non-magnetic stars were determined from their observed effective temperatures Teff and surface gravities log g by the spectroscopic method. We have used here the grid of theoretical mass-radius relations for carbon-core stars with hydrogen-envelopes derived by Panei et al. (2000). Mass distribution of DA white dwarfs with Teff ≥ 12000 K has one maximum at M=0.549 M&sun;. However, we discovered the existence of the secondary maximum at about 0.393 M&sun; for hotter white dwarf stars. We also turn attention to low-mass white dwarfs (M ≤ 0.45 M&sun;) with helium-cores and list them explicitly. The star of the lowest mass in our catalogue is SDSS J204949.78+000547.3 with mass M = 0.162 M&sun; and radius R=16047 km.
Ciechanowska Anna
Madej Jerzy
Majczyna Agnieszka
Nalezyty Miroslaw
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