The VLT-FLAMES Tarantula Survey. VIII. Multiplicity properties of the O-type star population
Hugues Sana,A. de Koter,A. de Koter,S. E. de Mink,S. E. de Mink,P. R. Dunstall,Chris Evans,Vincent Hénault-Brunet,J. Maíz Apellániz,O.H. Ramírez-Agudelo,W. D. Taylor,Nolan R. Walborn,J. S. Clark,Paul A. Crowther,Artemio Herrero,Artemio Herrero,Mark Gieles,Norbert Langer,D. J. Lennon,Jorick S. Vink +19 more
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In this paper, the multiplicity properties of the massive O-type star population were analyzed using multi-epoch spectroscopy and variability analysis to identify spectroscopic binaries.Abstract:
Aims. We analyze the multiplicity properties of the massive O-type star population. With 360 O-type stars, this is the largest homogeneous sample of massive stars analyzed to date. Methods. We use multi-epoch spectroscopy and variability analysis to identify spectroscopic binaries. We also use a Monte-Carlo method to correct for observational biases. Results. We observe a spectroscopic binary fraction of 0.35\pm0.03, which corresponds to the fraction of objects displaying statistically significant radial velocity variations with an amplitude of at least 20km/s. We compute the intrinsic binary fraction to be 0.51\pm0.04. We adopt power-laws to describe the intrinsic period and mass-ratio distributions: f_P ~ (log P)^\pi\ (with 0.15 7.8', i.e. approx117 pc) and among the O9.7 I/II objects are however significantly lower than expected from statistical fluctuations. Conclusions. Using simple evolutionary considerations, we estimate that over 50% of the current O star population in 30 Dor will exchange mass with its companion within a binary system. This shows that binary interaction is greatly affecting the evolution and fate of massive stars, and must be taken into account to correctly interpret unresolved populations of massive stars.read more
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Resolved companions of cepheids: testing the candidates with x-ray observations*
Nancy Remage Evans,Ignazio Pillitteri,Ignazio Pillitteri,Scott J. Wolk,Margarita Karovska,Evan Tingle,Edward F. Guinan,Scott G. Engle,Howard E. Bond,Howard E. Bond,Gail H. Schaefer,Brian D. Mason +11 more
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Stellar-mass black holes in young massive and open stellar clusters – V. comparisons with LIGO-Virgo merger rate densities
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Binary Red Supergiants: A New Method for Detecting B-type Companions
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Properties of six short-period massive binaries: A study of the effects of binarity on surface chemical abundances
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