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Communication Dans Un Congrès Année : 2000

Binaries at the Bottom of the Main Sequence and below

Résumé

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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hal-02054994 , version 1 (11-03-2019)

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Michel Mayor, Stéphane Udry, J.-L. Halbwachs, Frédéric Arenou. Binaries at the Bottom of the Main Sequence and below. IAU Symposium 200: The Formation of Binary Stars, Apr 2000, Potsdam, Germany. ⟨hal-02054994⟩
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