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The mass-ratio distribution of spectroscopic binaries along the main-sequence

Published online by Cambridge University Press:  07 March 2018

Henri M. J. Boffin  and
Dimitri Pourbaix
Henri M. J. Boffin
Affiliation:
ESO, Garching, Germany email: hboffin@eso.org
Dimitri Pourbaix
Affiliation:
Université Libre de Bruxelles and FRS-FNRS, Belgium email: pourbaix@astro.ulb.ac.be
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Abstract

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Binarity is now a well-established quality affecting a large fraction of stars, and recent studies have shown that the fraction of binaries is a function of the spectral type of the primary star, with most massive stars being member of a close binary system. By cross-matching TGAS with SB9, we went one step further and derived the mass ratio distribution of binary systems as a function of the spectral type of the primary star. This, combined with the binary fraction, provides very strong constraints on star formation and critical input for stellar population models.

Keywords

stars: binariesstars: evolutionHertzsprung-Russell diagram
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 339 - 340
Copyright
Copyright © International Astronomical Union 2018 

References

Boffin, H. M. J. 2010, A&A, 524, A14 Google Scholar
Bressan, A. et al. 2012, MNRAS, 427, 127 CrossRefGoogle Scholar
Lindegren, L. et al. 2016a A&A, 595, A4 Google Scholar
Pourbaix, D. et al. 2004, A&A, 424, 727 Google Scholar