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2003ApJ...599.1344M - Astrophys. J., 599, 1344-1356 (2003/December-3)

The mass ratio distribution in main-sequence spectroscopic binaries measured by infrared spectroscopy.


Abstract (from CDS):

We report infrared spectroscopic observations of a large well-defined sample of main-sequence, single-lined spectroscopic binaries to detect the secondaries and derive the mass ratio distribution of short-period binaries. The sample consists of 51 Galactic disk spectroscopic binaries found in the Carney and Latham high proper motion survey, with primary masses in the range 0.6-0.85 M. Our infrared observations detect the secondaries in 32 systems, two of which have mass ratios, q=M2/M1, as low as ∼0.20. Together with 11 systems previously identified as double-lined binaries by visible light spectroscopy, we have a complete sample of 62 binaries, of which 43 are double lined. The mass ratio distribution is approximately constant over the range q=1.0-0.3. The distribution appears to rise at lower q values, but the uncertainties are sufficiently large that we cannot rule out a distribution that remains constant. The mass distribution derived for the secondaries in our sample and that of the extrasolar planets apparently represent two distinct populations.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Spectroscopic - Infrared: Stars - Stars: Formation - Stars: Fundamental Parameters - Techniques: Radial Velocities

Simbad objects: 66

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