S320p.10 — White dwarf + main sequence binaries identified from the data release of the Sloan Digital Sky Survey (SDSS)

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Lifang Li1

Institution(s): 1. Yunnan Observatories/CAS

309 new white-dwarf (WD) + main-sequence (MS) star binaries are identified from the Sloan Digital Sky Survey (SDSS) Tenth Data Release (DR10). Most of them consist of a white dwarf and a low-mass secondary (typically M dwarf) companion. The SDSS spectra of the newly found WDMS binaries with a DA/DB white dwarf and an M/late-K dwarf companion are analyzed based on a spectral decomposition/fitting technigue, then the physical parameters of the WDs and MS stars are obtained. The stellar parameters of DA WDs with $T_{\rm eff}\la 14,000$ K are revised to the results in the case of a 3D model atmosphere. Two independent distance estimates are derived from the flux-scaling factors between the WDMS SDSS spectra and the white dwarf and M-dwarf model spectra. The distributions of the physical parameters are used to investigate the general properties of WDMS binaries, and the results shown in this work are consistent with those derived by previous investigators.