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New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12

Citation:

Kepler SO, Pelisoli I, Koester D, Ourique G, Romero AD, Reindl N, Kleinman SJ, Eisenstein DJ, Valois ADM, Amaral LA. New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12. Monthly Notices of the Royal Astronomical Society. 2016;455 :3413-3423.

Date Published:

February 1, 2016

Abstract:

We report the discovery of 6576 new spectroscopically confirmed whitedwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release12. We obtain Teff, log g and mass for hydrogen atmospherewhite dwarf stars (DAs) and helium atmosphere white dwarf stars (DBs),estimate the calcium/helium abundances for the white dwarf stars withmetallic lines (DZs) and carbon/helium for carbon-dominated spectra(DQs). We found one central star of a planetary nebula, one ultracompacthelium binary (AM CVn), one oxygen line-dominated white dwarf, 15 hotDO/PG1159s, 12 new cataclysmic variables, 36 magnetic white dwarf stars,54 DQs, 115 helium-dominated white dwarfs, 148 white dwarf +main-sequence star binaries, 236 metal-polluted white dwarfs, 300continuum spectra DCs, 230 hot subdwarfs, 2936 new hydrogen-dominatedwhite dwarf stars, and 2675 cool hydrogen-dominated subdwarf stars. Wecalculate the mass distribution of all 5883 DAs with S/N ≥ 15 inDR12, including the ones in DR7 and DR10, with an average S/N = 26,corrected to the 3D convection scale, and also the distribution aftercorrecting for the observed volume, using 1/Vmax.

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