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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POSYDON: A General-purpose Population Synthesis Code with Detailed Binary-evolution Simulations
Tassos Fragos,Jeff J. Andrews,Simone S. Bavera,Christopher P. L. Berry,Scott Coughlin,Aaron Dotter,Prabin Giri,Vicky Kalogera,Aggelos K. Katsaggelos,Konstantinos Kovlakas,Shamal Lalvani,Devina Misra,Philipp M. Srivastava,Ying Qin,Kyle A. Rocha,Jaime Roman-Garza,Juan G. Serra,Petter Stahle,Meng Sun,Xu Teng,Goce Trajcevski,Nam Hai Tran,Zepei Xing,Emmanouil Zapartas,M. Zevin +24 more
TL;DR: The use of POSYDON enables the self-consistent treatment of physical processes in stellar and binary evolution, including: realistic mass-transfer calculations and assessment of stability, internal angularmomentum transport and tides, stellar core sizes, mass- transfer rates and orbital periods.
Journal ArticleDOI
Early-type stars observed in the ESO UVES Paranal Observatory Project - V. Time-variable interstellar absorption
C. M. McEvoy,Jonathan Smoker,Philip Dufton,Keith T. Smith,Keith T. Smith,Michael B. Kennedy,Francis P. Keenan,David L. Lambert,Daniel E. Welty,James T. Lauroesch +9 more
TL;DR: In this paper, the structure and properties of the diffuse interstellar medium (ISM) on small scales, sub-au to 1 pc, are poorly understood, and the authors compare interstellar absorption lines, observed towards a selection of O- and B-type stars at two or more epochs, to search for variations over time caused by the transverse motion of each star combined with changes in the structure in the foreground ISM.
Journal ArticleDOI
Neutron Star-Black Hole Mergers from Gravitational Wave Captures
TL;DR: In this article, the authors examined single-single (sin-sin) gravitational wave (GW) captures in different types of star clusters and compared the merger rates from this channel to other proposed merger channels in the literature.
Dissertation
Is multiplicity universal? : a study of multiplicity in the young moving groups
TL;DR: In this article, a series of multiplicity studies aimed at producing comprehensive multiplicity statistics of the young moving groups is presented, which offer us one of the best opportunities to characterise stellar multiplicity, sub-stellar phenomena, disc evolution and planet formation.
Journal ArticleDOI
Multiplicity of the red supergiant population in the young massive cluster NGC 330
Lee Patrick,Lee Patrick,D. J. Lennon,D. J. Lennon,Christopher Evans,Hugues Sana,J. Bodensteiner,N. Britavskiy,N. Britavskiy,Ricardo Dorda,Ricardo Dorda,A. Herrero,A. Herrero,Ignacio Negueruela,A. de Koter,A. de Koter +15 more
TL;DR: In this article, a combination of multi-epochamber HARPS and MUSE spectroscopy was used to estimate radial velocities and assess the kinematic and multiplicity properties of 15 RSGs in NGC 330.
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