Magnetic White Dwarfs in the SDSS and Estimating the Mean Mass of Normal DA and DB WDs

Details Magnetic White Dwarfs in the SDSS and Estimating the Mean Mass of Normal DA and DB WDs Magnetic White Dwarfs in the SDSS and Estimating the Mean Mass of Normal DA and DB WDs

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273...19k&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 19-24 (2010).

Computer Science

Databases

5

White Dwarfs, Sky Surveys, Zeeman Effect, Stellar Magnetism, Radiative Transfer, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Zeeman And Stark Effects, Interplanetary Magnetic Fields, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation

Scientific paper

When classifying by eye more than 22 000 spectra selected as possible white dwarf stars from the Sloan Digital Sky Survey Data Release 7, we detected Zeeman splittings in more than 800 stars, increasing by a factor of five the number of known magnetic white dwarfs. Our field estimations range from 90 MG to less than 1 MG, complementing the detections by Külebi et al. [1]. These magnetic white dwarf stars cover the whole range of temperature and spectral classes observed.
As the Zeeman splittings broadens the lines, we cannot use the line profiles to estimate surface gravity directly. We therefore excluded the magnetic white dwarfs from our average mass estimate of normal DAs and DBs. Analysis of the remaining 1505 bright and hot DA white dwarfs, i.e., those with S/N>=20 and Teff = 12000 K, results in a mean mass DA = 0.604+/-0.003 Msolar, while that of our 82 bright DBs with Teff = 16000 K is DB = 0.646+/-0.006 Msolar.

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