Single and Composite Hot Subdwarf Stars in the Light of 2MASS All-Sky Photometry

Details Single and Composite Hot Subdwarf Stars in the Light of 2MASS All-Sky Photometry Single and Composite Hot Subdwarf Stars in the Light of 2MASS All-Sky Photometry

2003-09-05

arxiv.org/abs/astro-ph/0309194v1

Astrophys.Space Sci.291:333S,2004; Astrophys.Space Sci.291:333-336,2004

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. To appear in "Extreme Horizontal Branch Stars and Related Objects", Astrophysics and Space Science, Kluwer

Scientific paper

10.1023/B:ASTR.0000044340.84919.

Utilizing the Two Micron All Sky Survey (2MASS) All-Sky Data Release Catalog, we have retrieved useful near-IR J, H, and Ks magnitudes for more than 800 hot subdwarfs (sdO and sdB stars) drawn from the "Catalogue of Spectroscopically Identified Hot Subdwarfs" (Kilkenny, Heber, & Drilling 1988, 1992). This sample size greatly exceeds previous studies of hot subdwarfs. We find that, of the hot subdwarfs in Kilkenny et al., ~40% in a magnitude limited sample have colors that are consistent with the presence of an unresolved late type (FGK) companion. Binary stars are over-represented in a magnitude limited sample. In an approximately volume limited sample the fraction of composite-color binaries is ~25%.

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