2236 20160701171701.0 10.1111/j.1365-2966.2011.19035.x DOI ASTROimport-393 Fahed, R. 2011 Spectroscopy of the archetype colliding-wind binary WR 140 during the 2009 January periastron passage We present the results from the spectroscopic monitoring of WR 140 (WC7pd + O5.5fc) during its latest periastron passage in 2009 January. The observational campaign consisted of a constructive collaboration between amateur and professional astronomers. It took place at six locations, including Teide Observatory, Observatoire de Haute Provence, Dominion Astrophysical Observatory and Observatoire du Mont Mégantic. WR 140 is known as the archetype of colliding-wind binaries and it has a relatively long period (?8 yr) and high eccentricity (?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 and colliding-wind geometry. 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. Monthly Notices of the Royal Astronomical Society 418 1 2011 2-13 http://esoads.eso.org/abs/2011MNRAS.418....2F published in REFERD