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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References
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The massive star binary fraction in young open clusters – III. IC 2944 and the Cen OB2 association
Hugues Sana,G. James,Eric Gosset +2 more
TL;DR: In this article, the multiplicity properties of the O-type stars in IC 2944 and in the Cen OB2 association were investigated using an extended set of multi-epoch high-resolution high signal-to-noise ratio optical spectra.
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The multiplicity of massive stars
Hugues Sana,Chris Evans +1 more
TL;DR: In this paper, the authors discuss the parameter space occupied by massive binaries and the observational means to investigate it, and review the multiplicity fraction of OB stars within each regime, and in different astrophysical environments.
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The VLT-FLAMES Tarantula Survey. VII. A low velocity dispersion for the young massive cluster R136
Vincent Hénault-Brunet,Chris Evans,Chris Evans,Hugues Sana,Mark Gieles,Nate Bastian,J. Maíz Apellániz,Nevena Markova,W. D. Taylor,Eli Bressert,Eli Bressert,Eli Bressert,Paul A. Crowther,J. Th. van Loon +13 more
TL;DR: In this paper, the authors used the radial velocities of non-variable sources to place an upper limit of 6 km s −1 on the line-of-sight velocity dispersion of stars within a projected distance of 5 pc from the center of the cluster.
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Explosive Common-Envelope Ejection: Implications for Gamma-Ray Bursts and Low-Mass Black-Hole Binaries
TL;DR: In this paper, the authors present a new mechanism for the ejection of a common envelope in a massive binary, where the energy source is nuclear energy rather than orbital energy, which can occur during the slow merger of a massive primary with a secondary of 1-3 Msun when the primary has already completed helium core burning.
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Spectroscopic binaries with components of similar mass
TL;DR: In this paper, the twin hypothesis is investigated and a strong version of this hypothesis is found to be statistically significant for a sample restricted to orbits of high precision but claims that Hs is significant for binaries with special characteristics are not confirmed since the sample sizes are well below the minimum required for a reliable test.