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Binaries at the Bottom of the Main Sequence and below

Published online by Cambridge University Press:  13 May 2016

M. Mayor ,
S. Udry ,
J.-L. Halbwachs  and
F. Arenou
M. Mayor
Affiliation:
1 Observatoire de Genève, CH-1290 Sauverny, Switzerland
S. Udry
Affiliation:
1 Observatoire de Genève, CH-1290 Sauverny, Switzerland
J.-L. Halbwachs
Affiliation:
2 Observatoire de Strasbourg UMR 7550, F-67000 Strasbourg, France
F. Arenou
Affiliation:
3 DASGAL, Observatoire de Meudon, F-92195 Meudon, France

Abstract

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Long-term radial-velocity surveys of G, K and M dwarfs of the solar neighbourhood are presented. The inferred orbital elements are discussed, focusing on the (e, log P) diagram, the mass-ratio and secondary mass distributions, and on the binary frequency of the studied samples. The proportion of companions to M dwarfs is found to be not significantly different from the binary frequency among G- and K-dwarf primaries. The mass function of stellar and planetary companions to solar-type stars strongly suggests different formation and evolution mechanisms for the two populations. Finally, beautiful mass-luminosity relations are obtained from low-mass binaries with high-precision radial-velocity measurements and adaptive optics visual data.

Type
III. Main Sequence Binary Statistics
Information
Symposium - International Astronomical Union , Volume 200: The Formation of Binary Stars , 2001 , pp. 45 - 54
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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