Abstract
We investigate the line-profile variability observed in colliding wind binary systems. In these systems the ultraviolet P Cygni line profiles show marked orbital variability; the nature of which differs between individual lines and binaries. We present results of three-dimensional Monte-Carlo simulations of the radiative transfer and line formation in colliding wind binaries. We present results for an idealized binary system, illustrating some of the factors that will affect line-profile formation in such systems, and the potential complexity of interpreting such variability. In addition, we calculate the expected line-profile variability for the archetypal W-R+O binary V444 Cyg
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