IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
White dwarf mass distribution in the SDSS
Autor/es:
KEPLER, S.O.; KLEINMAN, S. J.; NITTA, A.; KOESTER, D.; CASTENHEIRA, B.; GIOVANNINI, O.; COSTA, A.F.M.; ALTHAUS, L. G.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Blackwell Publishing
Referencias:
Año: 2007 vol. 375 p. 1315 - 1324
ISSN:
0035-8711
Resumen:
We determined masses for the 7167 DA and 507 DB white dwarf stars classified as single and non-magnetic in Data Release 4 of the Sloan Digital Sky Survey (SDSS). We obtained revised Teff and logg determinations for the most massive stars by fitting the SDSS optical spectra with a synthetic spectra grid derived from model atmospheres extending to logg = 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 0.593 Msolar. For the 150 DBs brighter than g = 19 and hotter than Teff = 16000K, we find an average mass of 0.711 Msolar . 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 Msolar