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On the nature of the 35-day cycle in the X-ray binary Her X-1/HZ Her

Published online by Cambridge University Press:  30 December 2019

N. Shakura ,
D. Kolesnikov ,
K. Postnov ,
I. Volkov ,
I. Bikmaev ,
T. Irsmambetova ,
R. Staubert ,
J. Wilms ,
E. Irtuganov  and
P. Shurygin
...Show all authors
N. Shakura
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com Kazan Federal University, Kazan, Russia
D. Kolesnikov
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com
K. Postnov
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com Kazan Federal University, Kazan, Russia
I. Volkov
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com Institute of Astronomy RAS,Moscow, Russia
I. Bikmaev
Affiliation:
Kazan Federal University, Kazan, Russia
T. Irsmambetova
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com
R. Staubert
Affiliation:
Institute for Astronomy and Astrophysics, Tübingen, Germany
J. Wilms
Affiliation:
Astronomical Institute of the University of Erlangen-Nuremberg, Bamberg, Germany
E. Irtuganov
Affiliation:
Kazan Federal University, Kazan, Russia
P. Shurygin
Affiliation:
Kazan Federal University, Kazan, Russia
P. Golysheva
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com
S. Shugarov
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com Astronomical Institute of the Slovak Academy of Scienses, Tatranska Lomnica, Slovakia
I. Nikolenko
Affiliation:
Institute of Astronomy RAS,Moscow, Russia Crimean Astrophysical Observatory, Nauchny, Russia
E. Trunkovsky
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia email: nikolai.shakura@gmail.com
G. Schonherr
Affiliation:
Leibniz Institute for Astrophysics, Potsdam, Germany
A. Schwope
Affiliation:
Leibniz Institute for Astrophysics, Potsdam, Germany
D. Klochkov
Affiliation:
Institute for Astronomy and Astrophysics, Tübingen, Germany
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Abstract

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The X-ray binary Her X-1 consists of an accreting neutron star and the optical companion HZ Her. The 35-day X-ray variability of this system is known since its discovery in 1972 by the UHURU satellite and is believed to be caused by forced precession of the warped accretion disk tilted to the orbital plane. We argue that the observed features of the optical variability of HZ Her can be explained by free precession of the neutron star with a period close to that of the forced disk precession. The model parameters include a) the intensity (power) of the stream of matter flowing out of the optical star; b) the X-ray luminosity of the neutron star; c) the optical flux of the accretion disk; d) the X-ray irradiation pattern on the donor star; e) the tilt of the inner and outer edge of the accretion disk. A possible synchronization mechanism based on the coupling between the neutron star free precession and the dynamical action of non-stationary gas streams is discussed shortly.

Keywords

X-rays: binariesstars: neutronstars: binaries: close
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. 281 - 287
Copyright
© International Astronomical Union 2019 

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