The VLT-FLAMES Tarantula Survey V. The peculiar B[e]-like supergiant, VFTS698, in 30 Doradus

被引：12
|
作者：
Dunstall, P. R. [1 ]
Fraser, M. [1 ]
Clark, J. S. [2 ]
Crowther, P. A. [3 ]
Dufton, P. L. [1 ]
Evans, C. J. [4 ]
Lennon, D. J. [5 ]
Soszynski, I. [6 ]
Taylor, W. D. [7 ]
Vink, J. S. [8 ]
机构：
[1] Queens Univ Belfast, Dept Phys & Astron, Belfast BT7 1NN, Antrim, North Ireland
[2] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England
[3] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
[4] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland
[5] Space Telescope Sci Inst, ESA, Baltimore, MD 21218 USA
[6] Univ Warsaw Observ, PL-00478 Warsaw, Poland
[7] Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
[8] Armagh Observ, Armagh BT61 9DG, North Ireland
来源：
ASTRONOMY & ASTROPHYSICS | 2012年 / 542卷
基金：
英国科学技术设施理事会;
关键词：
stars: early-type; binaries: spectroscopic; stars: peculiar; stars:; emission-line; Be; stars: variables: general; LARGE-MAGELLANIC-CLOUD; GRAVITATIONAL LENSING EXPERIMENT; EFFECTIVE TEMPERATURE SCALE; B-TYPE SUPERGIANTS; MASSIVE STARS; SPECTRAL CLASSIFICATION; STELLAR EVOLUTION; IONIZING CLUSTER; BLUE VARIABLES; WESTERLUND;
D O I：
10.1051/0004-6361/201218872
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 similar to 0.6mag with a period of 12.7 d. In addition, we detect long-term photometric variations of similar to 0.25 mag, which may be due to a longer-term variability with a period of similar to 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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页数：17
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