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- Title
The VLT-FLAMES Tarantula Survey: V. The peculiar B[e]-like supergiant, VFTS698, in 30 Doradus.
- Authors
Dunstall, P. R.; Fraser, M.; Clark, J. S.; Crowther, P. A.; Dufton, P. L.; Evans, C. J.; Lennon, D. J.; Soszyński, I.; Taylor, W. D.; Vink, J. S.
- 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 km s-1 in the high excitation Si iv, N iii and He ii spectra, and photometric variability of ∼0.6 mag with a period of 12.7 d. In addition, we detect long-term photometric variations of ∼0.25 mag, 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.
- Subjects
B stars; MAGELLANIC clouds; DWARF galaxies; OPTICAL spectroscopy; INFRARED photography
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2012, Vol 542, Issue 1, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201218872