Spectroscopic follow-up of the colliding-wind binary WR140 during the 2009 January periastron passage

R. Fahed; A. F. J. Moffat; J. Zorec; T. Eversberg; A. N. Chené; F. Alves; W. Arnold; T. Bergmann; L. F. Gouveia Carreira; F. Marques Dias; A. Fernando; J. Sanchez Gallego; T. Hunger; J. Knapen; R. Leadbeater; T. Morel; G. Rauw; N. Reinecke; J. Ribeiro; N. Romeo; E. M. dos Santos; L. Schanne; O. Stahl; Ba. Stober; Be. Stober; N. G. Correia Viegas; K. Vollmann; M. F. Corcoran; S. M. Dougherty; J. M. Pittard; A. M. T. Pollock; P. M. Williams

Bulletin de la Société Royale des Sciences de Liège

0037-9565 1783-5720

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Spectroscopic follow-up of the colliding-wind binary WR140 during the 2009 January periastron passage

(Volume 80 - Année 2011)

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Abstract

We present the results from the spectroscopic follow-up of WR140 (WC7 + O4-5) during its last periastron passage in January 2009. This object is known as the archetype of colliding wind binaries and has a relatively large period (around 8 years) and eccentricity (around 0.9). We provide updated values for the orbital parameters, new estimates for the WR and O star masses and new constraints on the mass-loss rates.

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R. Fahed, A. F. J. Moffat, J. Zorec, T. Eversberg, A. N. Chené, F. Alves, W. Arnold, T. Bergmann, L. F. Gouveia Carreira, F. Marques Dias, A. Fernando, J. Sanchez Gallego, T. Hunger, J. Knapen, R. Leadbeater, T. Morel, G. Rauw, N. Reinecke, J. Ribeiro, N. Romeo, E. M. dos Santos, L. Schanne, O. Stahl, Ba. Stober, Be. Stober, N. G. Correia Viegas, K. Vollmann, M. F. Corcoran, S. M. Dougherty, J. M. Pittard, A. M. T. Pollock & P. M. Williams, «Spectroscopic follow-up of the colliding-wind binary WR140 during the 2009 January periastron passage», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 668 - 672 URL : http://popups.ulg.be/0037-9565/index.php?id=3133.