Journal
ASTRONOMY & ASTROPHYSICS
Volume 580, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201526192
Keywords
stars: early-type; binaries: spectroscopic; open clusters and associations: individual: 30 Doradus
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Funding
- Marie Sklodowska-Curie Reintegration Fellowship - European Commission [H2020-MSCA-IF-2014, 661502]
- UK Science and Technology Facilities Council
- Netherlands Science Foundation
- Department of Education and Learning in Northern Ireland
- Leverhulme Trust
- [182.D-0222]
- Marie Curie Actions (MSCA) [661502] Funding Source: Marie Curie Actions (MSCA)
- STFC [ST/M001334/1] Funding Source: UKRI
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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(3.5) d and mass ratios > 0.1) for the B-type stars, f(B)(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 f(B)(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.
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