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The O stars in the VLT-FLAMES Tarantula Survey

De Koter, A, Sana, H, Evans, CJ, Bagnoli, T, Bastian, N, Bestenlehner, JM, Bonanos, A, Bressert, E, Brott, I, Cantiello, M , Carraro, G, Clark, S, Crowther, P, De Mink, SE, Doran, E, Dufton, P, Dunstall, P, Garcia, M, Gräfener, G, Hénault-Brunet, V, Herrero, A, Howarth, I, Izzard, R, Köhler, K, Langer, N, Lennon, D, Apellániz, JM, Markova, N, Najarro, P, Puls, J, Ramirez, O, Sabín-Sanjulián, C, Simón-Díaz, S, Smartt, S, Stroud, V, Van Loon, JT, Taylor, W and Vink, JS (2011) The O stars in the VLT-FLAMES Tarantula Survey Journal of Physics: Conference Series, 328 (1).

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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 ow is poorly constrained.

Item Type: Article
Authors :
De Koter, A
Sana, H
Evans, CJ
Bagnoli, T
Bastian, N
Bestenlehner, JM
Bonanos, A
Bressert, E
Brott, I
Cantiello, M
Carraro, G
Clark, S
Crowther, P
De Mink, SE
Doran, E
Dufton, P
Dunstall, P
Garcia, M
Gräfener, G
Hénault-Brunet, V
Herrero, A
Howarth, I
Izzard, R
Köhler, K
Langer, N
Lennon, D
Apellániz, JM
Markova, N
Najarro, P
Puls, J
Ramirez, O
Sabín-Sanjulián, C
Simón-Díaz, S
Smartt, S
Stroud, V
Van Loon, JT
Taylor, W
Vink, JS
Date : 1 December 2011
DOI : 10.1088/1742-6596/328/1/012022
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:54
Last Modified : 17 May 2017 12:54

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