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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A Binary Star in the Superbubble N160 in the Large Magellanic Cloud
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Rotational velocities of single and binary O-type stars in the Tarantula Nebula
O.H. Ramírez-Agudelo,Hugues Sana,A. de Koter,Sergio Simón-Díaz,S. E. de Mink,Frank Tramper,Philip Dufton,Christopher Evans,Götz Gräfener,A. Herrero,Norbert Langer,D. J. Lennon,J. Maíz Apellániz,Nevena Markova,Francisco Najarro,Joachim Puls,William D. Taylor,Jorick S. Vink +17 more
TL;DR: In this article, the projected rotational velocity of O-type objects in the Tarantula nebula or 30 Doradus (30 Dor) region was determined using spectroscopic observations.
The BPT Diagram in Cosmological Galaxy Formation Simulations: Understanding the Physics Driving Offsets at High Redshift
Prerak Garg,Desika Narayanan,Nell Byler,Ryan L. Sanders,Alice E. Shapley,Allison L. Strom,Romeel Dav'e,Michaela Hirschmann,Christopher C. Lovell,Justin A. Otter,Gergö Popping,George C. Privon +11 more
TL;DR: In this article , the authors investigated the influence of varying ionization parameters, gas-phase abundance patterns, and increasing radiation field hardness on the N2-BPT diagrams and found that either decreasing the ionization parameter or increasing the N/O ratio of galaxies at fixed O/H can move galaxies along a self-similar arc in N2BPT space that is occupied by high-redshift galaxies.
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Constraints on the Galactic Centre environment from <i>Gaia</i> hypervelocity stars II: The evolved population
TL;DR: In this article , the authors showed that the lack of main-sequence HVS candidates with precise astrometric uncertainties and radial velocities in current data releases from the Gaia space mission places a robust upper limit on the ejection rate of HVSs from the Galactic Centre.
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Modelling binary rotating stars by new population synthesis code BONNFIRES
TL;DR: In this article, a new generation of population synthesis code, called BONNFIRES, was proposed to calculate nuclear reaction, various mixing processes and binary interaction in a timely fashion.
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