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The multiplicity of massive stars

Published online by Cambridge University Press:  12 July 2011

Hugues Sana  and
Christopher J. Evans
Hugues Sana
Affiliation:
Sterrenkundig Instituut Anton Pannekoek, University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, The Netherlands email: [email protected]
Christopher J. Evans
Affiliation:
UK Astronomy Technology Centre, Royal Observatory Edinburgh Blackford Hill, Edinburgh, EH9 3HJ, UK email: [email protected]
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Abstract

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Binaries are excellent astrophysical laboratories that provide us with direct measurements of fundamental stellar parameters. Compared to single isolated stars, multiplicity induces new processes, offering the opportunity to confront our understanding of a broad range of physics under the extreme conditions found in, and close to, astrophysical objects.

In this contribution, we will discuss the parameter space occupied by massive binaries, and the observational means to investigate it. We will review the multiplicity fraction of OB stars within each regime, and in different astrophysical environments. In particular we will compare the O star spectroscopic binary fraction in nearby open clusters and we will show that the current data are adequately described by an homogeneous fraction of f ≈ 0.44.

We will also summarize our current understanding of the observed parameter distributions of O + OB spectroscopic binaries. We will show that the period distribution is overabundant in short period binaries and that it can be described by a bi-modal Öpik law with a break point around P ≈ 10 d. The distribution of the mass-ratios shows no indication for a twin population of equal mass binaries and seems rather uniform in the range 0.2 ≤ q = M2/M1 ≤ 1.0.

Keywords

binaries (including multiple): closebinaries: generalbinaries: spectroscopicbinaries: visualstars: early-typeopen clusters and associations: individual (Col 228, IC1 805, IC 1848, IC 2944, NGC 330, NGC 346, NGC 2004, NGC 2244, NGC 6231, NGC 6611, N 11, Tr 14, Tr 16, West 1, 30 Dor)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 474 - 485
Copyright
Copyright © International Astronomical Union 2011

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