BD -3 deg 2525 - A spectroscopic binary subdwarf

Astronomy and Astrophysics – Astrophysics

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Binary Stars, Line Spectra, Stellar Spectrophotometry, Subdwarf Stars, Eccentric Orbits, Main Sequence Stars, Orbital Elements, Radial Velocity, Spectral Energy Distribution, White Dwarf Stars

Scientific paper

As a result of a Palomar radial velocity program of high-velocity stars, the sdG star BD -3°2525 was found to be a single-lined spectroscopic binary. The period is 113 days; the semiamplitude is small, 14.4 km s-1, and the eccentricity is large, e = 0.5. The authors place limits on the brightness, nature, and mass of the invisible secondary from multichannel spectrophotometry and from the orbit. A brief discussion of the frequency of binaries in population II suggests that close binaries are rare. The pair in BD -3°2525 is relatively wide and noninteracting.

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