Theoretical X-ray properties of colliding stellar winds in O+O star binaries

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X Ray Spectra, Binary Stars, Stellar Winds, Plasma Interactions, O Stars, Light Curve, Astronomical Models, Stellar Mass Ejection, Stellar Orbits, Rosat Mission, Luminosity

Scientific paper

This paper on colliding wind binaries presents a detailed and quantitative comparison between theoretical models of colliding winds and X-ray observations. We concentrate on colliding stellar winds in O+O star binaries. We calculate the expected X-ray spectra and orbital light curves, and investigate the effect of different parameters (mass-loss rate, orbital separation, system inclination, etc.) on the expected X-ray properties. In particular we investigate three model systems; one representing HD 165052 with equal winds, another representing HD 57060 with very unequal winds, and a third representing an intermediate case. We demonstrate the sensitive relationship between system wind parameters and the shape of the X-ray light curve, and discuss these models in relation to recent ROSAT results on O+O star colliding wind systems. We find that the variation in X-ray luminosity during the orbit is primarily a result of varying extinction of the intrinsic X-ray luminosity by the more massive wind in the system. We also present the results of spectral fitting to our synthetic spectra.

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