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The WR 140 periastron passage 2009: first results from MONS and other optical sources

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arxiv 1101.1430 v1 pith:DSLZGAVR submitted 2011-01-07 astro-ph.SR

R. Fahed , A. F. J. Moffat , J. Zorec , T. Eversberg , A. N. Chené , F. Alves , W. Arnold , T. Bergmann
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L. F. Gouveia Carreira F. Marques Dias A. Fernando J. Sanchez Gallego T. Hunger J. H. 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
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classification astro-ph.SR
keywords passageperiastronresultsarchetypebinariescollidingconstraintsduring
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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 (~ 8 years) and eccentricity (~ 0.89). 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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