Structure of X-ray irradiated stellar wind

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Stellar Winds, X Ray Astronomy, Ionization, Optical Thickness, Stellar Luminosity, Temperature Distribution

Scientific paper

In the present study of the effect of X-ray irradiation on the line-driven stellar wind in X-ray binary systems, the product of the X-ray luminosity L(x) and wind density n is used to distinguish between optically thick and thin wind regimes. Most of the wind-fed X-ray sources lie in the optically thick wind regime. Wind structure is determined on the basis of both the parameter xi = L(x)/nR-squared, where R is the distance from the X-ray source, and the optical thickness due to He. The formation of a fully ionized he region depends on L(x) and n in a way that differs from that of the Stromgren sphere. The region behind the He II ionization boundary in such an optically thick wind is little affected by X-ray irradiation, so that trace elements must be responsible for wind acceleration.

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