The VLT-FLAMES Tarantula Survey XXII . Multiplicity properties of the B-type stars

Content Provider	Semantic Scholar
Author	Lennon, Danny J. Bastian, Nate Yuri Beletsky Brott, Ines Cantiello, Matteo Carraro, Giovanni Clark, Simon Crowther, Paul A. Koter, Alex De Dufton, Philip L. Dunstall, Paul Gieles, Mark Götz, M. Gräfener Hénault-Brunet, Vincent Herrero, Artemio Langer, Norbert Apellániz, Jesus Máız Nevena Markova Najarro, Francisco Puls, Joachim Sana, Hugues Sérgio Simón-Dı́az Smartt, S. J. William, David Taylor, William David Vink, Jorick S.
Copyright Year	2009
Abstract	We investigate the multiplicity properties of 408 B-type stars observed in the 30 Doradus region of the Large Magellanic Cloud with multi-epoch spectroscopy from the VLT-FLAMES Tarantula Survey (VFTS). We use a cross-correlation method to estimate relative radial velocities from the helium and metal absorption lines for each of our targets. Objects with significant radial-velocity variations (and with an amplitude larger than 16 km s−1) are classified as spectroscopic binaries. We find an observed spectroscopic binary fraction (defined by periods of <10 d and mass ratios >0.1) for the B-type stars, fB(obs)= 0.25± 0.02, which appears constant across the field of view, except for the two older clusters (Hodge 301 and SL 639). These two clusters have significantly lower binary fractions of 0.08± 0.08 and 0.10± 0.09, respectively. Using synthetic populations and a model of our observed epochs and their potential biases, we constrain the intrinsic multiplicity properties of the dwarf and giant (i.e. relatively unevolved) B-type stars in 30 Dor. We obtain a present-day binary fraction fB(true)= 0.58± 0.11, with a flat period distribution. Within the uncertainties, the multiplicity properties of the B-type stars agree with those for the O stars in 30 Dor from the VFTS.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://arxiv.org/pdf/0909.1652v1.pdf
Alternate Webpage(s)	https://pure.qub.ac.uk/portal/files/16957666/The_VLT_Flames.pdf
Alternate Webpage(s)	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/01915464F63BC8CE182F3F65DDB646CE/S1743921311010647a.pdf/vltflames_tarantula_survey.pdf
Alternate Webpage(s)	http://authors.library.caltech.edu/56143/1/aa24414-14.pdf
Language	English
Access Restriction	Open
Subject Keyword	ABRA gene Binary number Classification Cross-correlation DWARF Helium Large Magellanic Catalogue of Stars Numerous Population Radial (radio) Receptors, Opioid, delta SL (complexity) Sleep Polysomnography Domain Stars, Celestial Synthetic intelligence Velocity (software development) Virtual Link Trunking multiplicity
Content Type	Text
Resource Type	Article