The O stars in the VLT-FLAMES Tarantula Survey

被引：5
|
作者：
de Koter, A. [1 ]
Sana, H. [1 ]
Evans, C. J.
Bagnoli, T. [1 ]
Bastian, N.
Bestenlehner, J. M.
Bonanos, A.
Bressert, E.
Brott, I.
Cantiello, M.
Carraro, G.
Clark, S.
Crowther, P.
de Mink, S. E.
Doran, E.
Dufton, P.
Dunstall, P.
Garcia, M.
Graefener, G.
Henault-Brunet, V.
Herrero, A.
Howarth, I.
Izzard, R.
Koehler, K.
Langer, N.
Lennon, D.
Apellaniz, J. Maiz
Markova, N.
Najarro, P.
Puls, J.
Ramirez, O. [1 ]
Sabin-Sanjulian, C.
Simon-Diaz, S.
Smartt, S.
Stroud, V.
van Loon, J. Th
Taylor, W.
Vink, J. S.
机构：
[1] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1090 GE Amsterdam, Netherlands
来源：
GREAT-ESF WORKSHOP: STELLAR ATMOSPHERES IN THE GAIA ERA | 2011年 / 328卷
关键词：
ATMOSPHERIC NLTE-MODELS; B-TYPE STARS; MASSIVE STARS; SPECTROSCOPIC ANALYSIS; MAGELLANIC-CLOUD; BLUE STARS; ROTATION; WINDS;
D O I：
10.1088/1742-6596/328/1/012022
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The VLT-FLAMES Tarantula Survey (VFTS) has secured mid-resolution spectra of over 300 O-type stars in the 30 Doradus region of the Large Magellanic Cloud. A homogeneous analysis of such a large sample requires automated techniques, an approach that will also be needed for the upcoming analysis of the Gaia surveys of the Northern and Southern Hemisphere supplementing the Gaia measurements. We point out the importance of Gaia for the study of O stars, summarize the O star science case of VFTS and present a test of the automated modeling technique using synthetically generated data. This method employs a genetic algorithm based optimization technique in combination with FASTWIND model atmospheres. The method is found to be robust and able to recover the main photospheric parameters accurately. Precise wind parameters can be obtained as well, however, as expected, for dwarf stars the rate of acceleration of the flow is poorly constrained.
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页数：8
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