Paper:	The Orbit and Proper Motion of WR 140
Volume:	465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat
Page:	336
Authors:	Smith, I. A.; Dougherty, S. M.; Beasley, A. J.
Abstract:	Thirty-six milli-arcsecond resolution VLBA observations of the colliding-wind binary system WR 140 reveal the motion of the wind-collision region (WCR) during two orbit cycles. This motion is a combination of the proper motion and the orbital motion of the binary system. Using orbit parameters derived from optical spectroscopy (Fahed et al. 2011) and near-IR interferometric observations that resolve the binary system (Monnier et al. 2004), the separation of the centre of mass and the WCR is determined through fitting the proper motion of the WCR. The absolute position of the stars, the proper motion of the centre of mass of the system, the total mass, mass ratio, the wind-momentum ratio, and the most massive component are determined.

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