Wind inhibition by X-ray irradiation in high-mass X-ray binaries

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Authors

KRTIČKA Jiří KUBÁT Jiří KRTIČKOVÁ Iva

Year of publication 2017
Type Article in Proceedings
Conference The Lives and Death-Throes of Massive Stars, Proceedings of the International Astronomical Union
MU Faculty or unit

Faculty of Science

Citation
Web https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/wind-inhibition-by-xray-irradiation-in-highmass-xray-binaries/EF4406EB5A7FFE5912B2A844A7E3B9E5
Doi http://dx.doi.org/10.1017/S1743921317002381
Keywords Stars: early-type; stars: mass loss; stars: winds; outflows
Description Winds of hot massive stars are driven radiatively by light absorption in the lines of heavier elements. Therefore, the radiative force depends on the wind ionization. That is the reason why the accretion powered X-ray emission of high-mass X-ray binaries influences the radiative force and may even lead to wind inhibition. We model the effect of X-ray irradiation on the stellar wind in high-mass X-ray binaries. The influence of X-rays is given by the Xray luminosity, by the optical depth between a given point and the X-ray source, and by the distance to the X-ray source. The influence of X-rays is stronger for higher X-ray luminosities and in closer proximity of the X-ray source. There is a forbidden area in the diagrams of X-ray luminosity vs. the optical depth parameter. The observations agree with theoretical predictions, because all wind-powered high-mass X-ray binary primaries lie outside the forbidden area. The positions of real binaries in the diagram indicate that their X-ray luminosities are self-regulated.
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