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Wind inhibition in HMXBs: the effect of clumping and implications for X-ray luminosity

Published online by Cambridge University Press:  30 December 2019

Jiří Krtička ,
Jiří Kubát  and
Iva Krtičková
Jiří Krtička
Affiliation:
Ústav teoretické fyziky a astrofyziky, Masarykova univerzita, Brno, Czech Republic email: [email protected]
Jiří Kubát
Affiliation:
Astronomický ústav, Akademie věd České republiky, Ondřejov, Czech Republic email: [email protected]
Iva Krtičková
Affiliation:
Ústav teoretické fyziky a astrofyziky, Masarykova univerzita, Brno, Czech Republic email: [email protected]
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Abstract

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Winds of hot stars are driven by the radiative force due to absorption of light in the lines of heavier elements. Consequently, the mass-loss rate and the wind velocity depend on the ionization state of the wind. As a result of this, there is a feedback between the ionizing X-ray source and the stellar wind in HMXBs powered by wind accretion. We study the influence of the small-scale wind structure (clumping) on this feedback using our NLTE hydrodynamical wind models. We find that clumping weakens the effect of X-ray irradiation. Moreover, we show that the observed X-ray luminosities of HMXBs can not be explained by wind accretion scenario without introducing the X-ray feedback. Taking into account the feedback, the observed and estimated X-ray luminosities nicely agree. We identify two cases of X-ray feedback with low and high X-ray luminosities that can explain the dichotomy between SFXTs and sgXBs.

Keywords

Stars: windsoutflowsstars: mass-lossstars: early-typeX-rays: binarieshydrodynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 28 - 33
Copyright
© International Astronomical Union 2019 

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