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Title:
Statistical properties of solar-type close binaries
Authors:
Halbwachs, J.-L.; Mayor, M.; Udry, S.; Arenou, F.
Affiliation:
AA(Observatoire Astronomique de Strasbourg, France)
Publication:
The Environment and Evolution of Double and Multiple Stars, Proceedings of IAU Colloquium 191, held 3-7 February, 2002 in Merida, Yucatan, Mexico. Edited by Christine Allen & Colin Scarfe. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 21, pp. 20-27 (2004) (http://www.astroscu.unam.mx/~rmaa/) (RMxAC Homepage)
Publication Date:
08/2004
Origin:
RMXAA
Keywords:
binaries: general, binaries: spectroscopic, stars: formation
Bibliographic Code:
2004RMxAC..21...20H

Abstract

Two Coravel radial velocity surveys dedicated to F7-K field dwarfs and to open clusters are merged in order to investigate the statistical properties of binaries with periods up to 10 years. Thanks to the accurate trigonometric parallaxes provided by Hipparcos, an unbiased sample of spectroscopic binaries (SB) is selected. After correction for the uncertainties of the measurements, the following results are obtained: 1. The distribution of mass ratios exhibits a peak for equal-mass binaries (twins), which is higher for short-period binaries than for long-period binaries. 2. Apart from the twins, the distribution of mass ratios exhibits a broad peak from 0.2 to 0.6. 3. The orbital eccentricities of twins are slightly smaller than those of other binaries. 4. An excess of SB is observed with periods shorter than about 50 days in comparison with the Duquennoy and Mayor log-normal distribution of periods. These features suggest that close binary stars are generated by two different processes. A possible difference could come from the accretion onto the binary, for instance from a common envelope or from a circumbinary disk. Alternatively, twins could come from dynamic evolution of multiple systems. It is not clear whether the formation models are already sufficiently elaborated to reproduce our statistics.
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