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CORAVEL Surveys to Study Binaries of Different Masses and Ages

Published online by Cambridge University Press:  12 April 2016

M. Mayor ,
A. Duquennoy ,
J.-L. Halbwachs  and
J.-C. Mermilliod
M. Mayor
Affiliation:
Geneva Observatory, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
A. Duquennoy
Affiliation:
Geneva Observatory, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
J.-L. Halbwachs
Affiliation:
Strasbourg Observatory, 11 rue de l’Université, F-69000 Strasbourg, France
J.-C. Mermilliod
Affiliation:
Lausanne Astronomical Institute, CH-1290 Chavannes-des-Bois, Switzerland

Abstract

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Preliminary results are given for a systematic survey of K-dwarf stars in the solar vicinity. Nine companions to the G and K dwarfs have very low M2 sin i, less than 0.08 M⊙. These detections from a sample of 540 G and K primary stars support the reality of the existence of companions with mass below 0.08 M⊙: brown dwarfs exist.

A comparison of the relative mass function distribution f(m)/M1 between low-mass (M1 < 1.3 M⊙) and intermediate-mass (2 < M1 < 5 M⊙) binaries suggests a dependence of the mass-ratio distribution on the mass of the primary: f(q, M1).

By combining the photometric information with orbital elements constraints, we have derived the mass-ratio distribution for intermediate-mass stars. As is the case for low-mass stars, this distribution does not have any maximum close to M2/M1 = 1.

Type
Spectroscopic Studies
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 73 - 81
Copyright
Copyright © Astronomical Society of the Pacific 1992

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