Hydrogen-Atmosphere White Dwarfs Are Less Likely To Be Found with Wide-Binary Companions

2024/07/24 by Heyl, Jeremy
#FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR)

paper · doi:10.48550/arxiv.2407.17634

Abstract

The fraction of white dwarfs found in wide binaries is estimated by cross referencing a catalogue of wide binaries with catalogues photometrically determined white-dwarf candidates and spectroscopically confirmed white dwarf stars. The wide-binary fraction of white dwarfs with hydrogen-dominated atmospheres is about 5%, but the fraction of white dwarfs with helium or carbon-dominated atmospheres is significantly larger. Using spectroscopic classifications, the binary fraction of DA white dwarfs is determined to be 0.063±0.002 and for non-DA white dwarfs is larger at 0.080±0.004.

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