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Title:
The Nearby Spectroscopic Binaries re--visited with Hipparcos
Authors:
Halbwachs, Jean--Louis; Arenou, Frédéric; Mayor, Michel; Udry, Stéphane
Affiliation:
AA(Observatoire Astronomique de Strasbourg, UMR 7550 11, rue de l'université, F-67000 Strasbourg, France ), AB(DASGAL, Observatoire de Paris--Meudon, bat 11, 5 place J. Janssen, F-92195 Meudon Cedex, France ), AC(Geneva Observatory, 51 chemin des Maillettes, CH-1290 Sauverny, Switzerland ), AD(Geneva Observatory, 51 chemin des Maillettes, CH-1290 Sauverny, Switzerland )
Publication:
Birth and Evolution of Binary Stars, Poster Proceedings of IAU Symposium No. 200 on The Formation of Binary Stars, held 10-15 April, 2000, in Potsdam, Germany. Edited by Bo Reipurth and Hans Zinnecker, 2000, p. 132.
Publication Date:
00/2000
Origin:
AUTHOR
Bibliographic Code:
2000IAUS..200P.132H

Abstract

Some results of the Coravel survey of spectroscopic binaries among nearby stars are revised, using additional data coming from the Hipparcos satellite. The high precision Hipparcos parallaxes are used to select a sample of F7--K main sequence stars unaffected by the bias in favor of binaries with equally bright components. The Hipparcos astrometric measurements are combined with the elements of the spectroscopic orbits, providing important constraints on the mass ratios of the single--lined spectroscopic binaries. The distribution of the mass ratios of the binaries with periods shorter than 10 years is derived, taking into account the selection effects. This distribution is rising from q = cal M2 / cal M1 ≅ 0.02 to q ≅ 0.2. It could be constant for q > 0.2. The distribution of logarithms of periods, P, is not constant, but rising. Finally, 11% of the F7--K dwarf stars are binaries with periods shorter than 10 years.

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