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Dunstall, P. R.; Fraser, M.; Clark, J. S.; Crowther, P. A.; Dufton, P. L.; Evans, C. J.; Lennon, D. J.; Soszynski, I.; Taylor, W. D. and Vink, J. S.
(2012).
DOI: https://doi.org/10.1051/0004-6361/201218872
Abstract
Aims. We present an analysis of a peculiar supergiant B-type star (VFTS698/Melnick 2/Parker 1797) in the 30 Doradus region of the Large Magellanic Cloud which exhibits characteristics similar to the broad class of B[e] stars.
Methods. We analyse optical spectra from the VLT-FLAMES survey, together with archival optical and infrared photometry and X-ray imaging to characterise the system.
Results. We find radial velocity variations of around 400 kms−1 in the high excitation Si iv, Niii and He ii spectra, and photometric variability of ~0.6mag with a period of 12.7 d. In addition, we detect long-term photometric variations of ~0.25mag, which may be due to a longer-term variability with a period of ~400 d.
Conclusions. We conclude that VFTS698 is likely an interacting binary comprising an early B-type star secondary orbiting a veiled, more massive companion. Spectral evidence suggests a mid-to-late B-type primary, but this may originate
from an optically-thick accretion disc directly surrounding the primary.
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About
- Item ORO ID
- 35958
- Item Type
- Journal Item
- ISSN
- 1432-0746
- Keywords
- early-type stars; spectroscopic binaries; peculiar stars; stellar emission-line, Be; variable stars
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2012 ESO
- Related URLs
-
- http://oro.open.ac.uk/31849/(Publication)
- http://oro.open.ac.uk/35961/(Publication)
- http://oro.open.ac.uk/53986/(Publication)
- http://oro.open.ac.uk/53981/(Publication)
- http://oro.open.ac.uk/53979/(Publication)
- http://oro.open.ac.uk/53983/(Publication)
- Depositing User
- J. Simon Clark