Magnetic white dwarf stars in the Sloan Digital Sky Survey

作者：Kepler S O^*; Pelisoli I; Jordan S; Kleinman S J; Koester D; Kuelebi B; Pecanha V; Castanheira B G; Nitta A; Costa J E S; Winget D E; Kanaan A; Fraga L

来源：Monthly Notices of the Royal Astronomical Society, 2013, 429(4): 2934-2944.

DOI：10.1093/mnras/sts522

• stars: magnetic field
• white dwarfs

To obtain better statistics on the occurrence of magnetism among white dwarfs, we searched the spectra of the hydrogen atmosphere white dwarf stars (DAs) in the Data Release 7 of the Sloan Digital Sky Survey (SDSS) for Zeeman splittings and estimated the magnetic fields. We found 521 DAs with detectable Zeeman splittings, with fields in the range from around 1 to 733 MG, which amounts to 4 per cent of all DAs observed. As the SDSS spectra have low signal-to-noise ratios, we carefully investigated by simulations with theoretical spectra how reliable our detection of magnetic field was.

• 出版日期2013-3