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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Mesa isochrones and stellar tracks (mist). i. solar-scaled models
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References
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The VLT-FLAMES Tarantula Survey: I. Introduction and observational overview⋆
Chris Evans,W. D. Taylor,Vincent Hénault-Brunet,Hugues Sana,A. de Koter,A. de Koter,Sergio Simón-Díaz,Sergio Simón-Díaz,Giovanni Carraro,T. Bagnoli,Nate Bastian,Joachim M. Bestenlehner,Alceste Z. Bonanos,Eli Bressert,Eli Bressert,Eli Bressert,Ines Brott,Ines Brott,M. A. Campbell,Matteo Cantiello,J. S. Clark,Edgardo Costa,Paul A. Crowther,S. E. de Mink,E. Doran,Philip Dufton,P. R. Dunstall,K. Friedrich,Miriam Garcia,Miriam Garcia,Mark Gieles,Götz Gräfener,Artemio Herrero,Artemio Herrero,Ian D. Howarth,Robert G. Izzard,Norbert Langer,D. J. Lennon,J. Maíz Apellániz,Nevena Markova,Francisco Najarro,J. Puls,O. H. Ramirez,C. Sabín-Sanjulián,C. Sabín-Sanjulián,Stephen J. Smartt,V. E. Stroud,V. E. Stroud,J. Th. van Loon,Jorick S. Vink,Nolan R. Walborn +50 more
TL;DR: The VLT-FLAMES Tarantula Survey (VFTS) as discussed by the authors is an ESO Large Programme that has obtained multi-epoch optical spectroscopy of over 800 massive stars in the 30 Doradus region of the Large Magellanic Cloud (LMC).
Journal ArticleDOI
The VLT-FLAMES Tarantula Survey I: Introduction and observational overview
Chris Evans,W. D. Taylor,Vincent Hénault-Brunet,Hugues Sana,A. de Koter,Sergio Simón-Díaz,Giovanni Carraro,T. Bagnoli,Nate Bastian,J. M. Bestenlehner,Alceste Z. Bonanos,Eli Bressert,Ines Brott,M. A. Campbell,Matteo Cantiello,J. S. Clark,Edgardo Costa,Paul A. Crowther,S. E. de Mink,E. Doran,Philip Dufton,P. R. Dunstall,K. Friedrich,Miriam Garcia,Mark Gieles,G. Graefener,A. Herrero,I. D. Howarth,Robert G. Izzard,Norbert Langer,D. J. Lennon,J. Maíz Apellániz,Nevena Markova,Francisco Najarro,J. Puls,O. H. Ramirez,C. Sabin-Sanjulian,Stephen J. Smartt,V. E. Stroud,J. Th. van Loon,Jorick S. Vink,Nolan R. Walborn +41 more
TL;DR: The VLT-FLAMES Tarantula Survey (VFTS) as discussed by the authors is an ESO Large Programme that has obtained multi-epoch optical spectroscopy of over 800 massive stars in the 30 Doradus region of the Large Magellanic Cloud (LMC).
Journal ArticleDOI
Rotational mixing in massive binaries - Detached short-period systems
S. E. de Mink,Matteo Cantiello,Norbert Langer,Norbert Langer,Onno R. Pols,Ines Brott,S.-Ch. Yoon +6 more
TL;DR: In this article, the effects of rotational mixing on the surface enhancements of massive main-sequence stars in short-period binary systems were investigated using a state-of-the-art stellar evolution code including the effect of rotation, tides, and magnetic fields.
Journal ArticleDOI
The First Stars: Mass Growth Under Protostellar Feedback
TL;DR: In this paper, a three-dimensional cosmological simulation of Pop III stars under radiative feedback is presented, showing that the most likely outcome is a massive Pop III binary.
Journal ArticleDOI
Spectral Classification of the 30 Doradus Stellar Populations
Nolan R. Walborn,J. Chris Blades +1 more
TL;DR: In this paper, an optical spectral classification study of 106 OB stars within the 30 Doradus Nebula has sharpened the description of the spatial and temporal structures among the associated clusters, and five distinct stellar groups are recognized: (1) the central early-O (Carina phase) concentration, which includes Radcliffe 136 (R136); (2) a younger (Orion phase) population to the north and west of R136, containing heavily embedded early O dwarfs and IR sources, the formation of which was likely triggered by the central concentration; (3) an older