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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Stefano Rubele,Stefano Rubele,Leandro Kerber,Léo Girardi,Maria-Rosa L. Cioni,Maria-Rosa L. Cioni,Paola Marigo,Simone Zaggia,Kenji Bekki,R. de Grijs,R. de Grijs,Jim Emerson,Martin Groenewegen,Marco Gullieuszik,Valentin D. Ivanov,Brent Miszalski,Joana M. Oliveira,Ben L. Tatton,J. Th. van Loon +18 more
TL;DR: In this article, the star formation history (SFH) for several regions of the Large Magellanic Cloud (LMC) was derived from the simultaneous reconstruction of two different color-magnitude diagrams (CMDs), using the minimization code StarFISH together with a database of partial models representing the CMDs of LMC populations of various ages and metallicities, plus a partial model for the Milky Way foreground.
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TL;DR: In this paper, 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, was proposed, which can occur during the slow merger of a massive primary with a secondary of 1-3 M⊙ when the primary has already completed helium core burning.
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The massive star binary fraction in young open clusters – II. NGC 6611 (Eagle Nebula)
TL;DR: In this article, the spectral classication and multiplicity status of the nine O-type stars in NGC 6611 in the core of the Eagle Nebula (M16) were investigated using a set of over 100 medium-to high-resolution optical spectra collected from 2003 to 2009.
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The low-mass initial mass function in the 30 doradus starburst cluster
Morten Andersen,Hans Zinnecker,A. Moneti,Mark J. McCaughrean,Mark J. McCaughrean,Bernhard R. Brandl,Wolfgang Brandner,G. Meylan,Deidre A. Hunter +8 more
TL;DR: In this article, the stellar initial mass function (IMF) of the starburst cluster 30Dor (NGC 2070) in the Large Magellanic Cloud (LMC) was derived using the deep Hubble Space Telescope NICMOS 2 F160W band observations.
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A Double Cluster at the Core of 30 Doradus
Elena Sabbi,D. J. Lennon,Mark Gieles,S. E. de Mink,S. E. de Mink,Nolan R. Walborn,Jonathan Anderson,Andrea Bellini,Nino Panagia,R. P. van der Marel,J. Maíz Apellániz +10 more
TL;DR: In this paper, the identification of two distinct stellar populations in the core of the giant H II region 30 Doradus in the Large Magellanic Cloud was reported based on an analysis of data obtained with the Wide Field Camera 3 on the Hubble Space Telescope.