The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars
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.
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.Attached Files
Published - aa24414-14.pdf
Submitted - 1501.04108v1.pdf
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Additional details
- Eprint ID
- 56143
- Resolver ID
- CaltechAUTHORS:20150326-134713991
- NAS 5-26555
- NASA
- PF3-140105
- NASA Einstein Fellowship
- 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
- Ministerio de Economía y Competitividad (MINECO)
- SEV-2011-0187
- Severo Ochoa
- PID2010119
- Canary Islands Government
- Created
-
2015-03-26Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field