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The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars

Evans, C. J. and Kennedy, M. B. and Dufton, P. L. and Howarth, I. D. and Walborn, N. R. and Markova, N. and Clark, J. S. and de Mink, S. E. and de Koter, A. and Dunstall, P. R. and Hénault-Brunet, V. and Maíz Apellániz, J. and McEvoy, C. M. and Sana, H. and Simón-Díaz, S. and Taylor, W. D. and Vink, J. S. (2015) The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars. Astronomy and Astrophysics, 574 . Art. No. A13. ISSN 0004-6361. http://resolver.caltech.edu/CaltechAUTHORS:20150326-134713991

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Abstract

We present spectral classifications for 438 B-type stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud. Radial velocities are provided for 307 apparently single stars, and for 99 targets with radial-velocity variations which are consistent with them being spectroscopic binaries. We investigate the spatial distribution of the radial velocities across the 30 Dor region, and use the results to identify candidate runaway stars. Excluding potential runaways and members of two older clusters in the survey region (SL 639 and Hodge 301), we determine a systemic velocity for 30 Dor of 271.6 ± 12.2 kms^(-1) from 273 presumed single stars. Employing a 3σ criterion we identify nine candidate runaway stars (2.9% of the single stars with radial-velocity estimates). The projected rotational velocities of the candidate runaways appear to be significantly different to those of the full B-type sample, with a strong preference for either large (≥345 kms-1) or small (≤65 kms^(-1)) rotational velocities. Of the candidate runaways, VFTS 358 (classified B0.5: V) has the largest differential radial velocity (−106.9 ± 16.2 kms^(-1)), and a preliminary atmospheric analysis finds a significantly enriched nitrogen abundance of 12 + log (N/H) ≳ 8.5. Combined with a large rotational velocity (v_esini = 345 ± 22 kms^(-1)), this is suggestive of past binary interaction for this star.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201424414DOIArticle
http://www.aanda.org/articles/aa/abs/2015/02/aa24414-14/aa24414-14.htmlPublisherArticle
http://arxiv.org/abs/1501.04108arXivDiscussion Paper
Additional Information:© 2015 ESO. Received 17 June 2014. Accepted 25 August 2014. Published online 16 January 2015. Based on observations at the European Southern Observatory Very Large Telescope in programme 182.D-0222. We thank Mark Gieles for helpful discussions regarding the candidate runaways, and the referee for their constructive comments. STScI is operated by AURA Inc., under NASA contract NAS 5-26555. S.d.M. acknowledges support for this work by NASA through an Einstein Fellowship grant, PF3-140105. J.M.A. acknowledges support by grants AYA2010-17631 and AYA2010-15081 of the Spanish Ministry of Economy and Competitiveness. S.S.-D. acknowledges funding from the Spanish Government Ministerio de Economía y Competitividad (MINECO) through grants AYA2010-21697-C05-04, AYA2012-39364-C02-01 and Severo Ochoa SEV-2011-0187, and the Canary Islands Government under grant PID2010119.
Funders:
Funding AgencyGrant Number
NASANAS 5-26555
NASA Einstein FellowshipPF3-140105
Ministerio de Economía y Competitividad (MINECO)AYA2010-17631
Ministerio de Economía y Competitividad (MINECO)AYA2010-15081
Ministerio de Economía y Competitividad (MINECO)AYA2010-21697-C05-04
Ministerio de Economía y Competitividad (MINECO)AYA2012-39364-C02-01
Severo OchoaSEV-2011-0187
Canary Islands GovernmentPID2010119
Subject Keywords:stars: fundamental parameters – stars: early-type – open clusters and associations: individual: NGC 2060 – open clusters and associations: individual: NGC 2070 – open clusters and associations: individual: Hodge 301 – open clusters and associations: individual: SL 639
Record Number:CaltechAUTHORS:20150326-134713991
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150326-134713991
Official Citation:The VLT-FLAMES Tarantula Survey - XVIII. Classifications and radial velocities of the B-type stars C. J. Evans, M. B. Kennedy, P. L. Dufton, I. D. Howarth, N. R. Walborn, N. Markova, J. S. Clark, S. E. de Mink, A. de Koter, P. R. Dunstall, V. Hénault-Brunet, J. Maíz Apellániz, C. M. McEvoy, H. Sana, S. Simón-Díaz, W. D. Taylor and J. S. Vink A&A 574 A13 (2015) DOI: http://dx.doi.org/10.1051/0004-6361/201424414
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56143
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Mar 2015 21:13
Last Modified:10 Mar 2017 23:58

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