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Title:
Binaries at the Bottom of the Main Sequence and below
Authors:
Mayor, M.; Udry, S.; Halbwachs, J.-L.; Arenou, F.
Affiliation:
AA(Observatoire de Genève, CH-1290 Sauverny, Switzerland), AB(Observatoire de Genève, CH-1290 Sauverny, Switzerland), AC(Observatoire de Strasbourg UMR 7550, F-67000 Strasbourg, France), AD(DASGAL, Observatoire de Meudon, F-92195 Meudon, France)
Publication:
The Formation of Binary Stars, Proceedings of IAU Symp. 200, held 10-15 April 2000, in Potsdam, Germany, Edited by Hans Zinnecker and Robert D. Mathieu, 2001, p. 45.
Publication Date:
00/2001
Origin:
AUTHOR
Keywords:
SPECTROSCOPIC BINARIES, SUBSTELLAR COMPANIONS
Comment:
ISBN: 1-58381-068-4
Bibliographic Code:
2001IAUS..200...45M

Abstract

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.
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