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| Paper: |
Physical Parameters of DA White Dwarfs from the Sloan Digital Sky Survey |
| Volume: |
372, 15th European Workshop on White Dwarfs |
| Page: |
49 |
| Authors: |
Ciechanowska, A.; Nalezyty, M.; Majczyna, A.; Madej, J. |
| Abstract: |
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 = 0.549M⊙. However, we discovered the existence of the secondary maximum at about 0.393M⊙ for hotter white dwarf stars. We also turn attention to low-mass white dwarfs (M ≤ 0.45M⊙) 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 = 0.162M⊙ and radius R = 16047 km. |
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