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

published in Proceedings of a Scientific Meeting in Honor of Anthony F. J. Moffat, 465, pp. 372 (2012)

Abstract: We present the results from two optical spectroscopic campaigns on colliding-wind binaries (CWB) which both occurred in 2009. The first one was on WR 140 (WC7pd + O5.5fc), the archetype of CWB, which experienced periastron passage of its highly elliptical 8-year orbit in January. The WR 140 campaign consisted of a unique and constructive collaboration between amateur and professional astronomers and took place at half a dozen locations, including Teide Observatory, Observatoire de Haute Provence, Dominion Astrophysical Observatory, Observatoire du Mont-Mégantic and at several small private observatories. The second campaign was on a selection of 5 short-period WR + O binaries not yet studied for colliding-wind effects: WR 12 (WN8h), WR 21 (WN5o + O7 V), WR 30 (WC6 + O7.5 V), WR 31 (WN4o + O8), and WR 47 (WN6o + O5). The campaign took place at Leoncito Observatory, Argentina, during 1 month. We provide updated values of most of these systems for the orbital parameters, new estimates for the WR and O star masses and new constraints on the mass-loss rates and colliding wind geometry.

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