On the nature of the 35-day cycle in the X-ray binary Her X-1/HZ Her
Shakura N, Kolesnikov D, Postnov K, Volkov I, Bikmaev I, Irsmambetova T, Staubert R, Wilms J, Irtuganov E, Shurygin P, Golysheva P, Shugarov S, Nikolenko I, Trunkovsky E, Schonherr G, Schwope A, Klochkov D (2019)
Publication Type: Book chapter / Article in edited volumes
Publication year: 2019
Journal
Publisher: Cambridge University Press
Edited Volumes: High-mass X-ray Binaries: Illuminating the Passagefrom Massive Binaries to Merging Compact Objects
Series: Proceedings of the International Astronomical Union
Book Volume: 346
Pages Range: 281-287
DOI: 10.1017/S1743921319002151
Abstract
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.
Authors with CRIS profile
Involved external institutions
Eberhard Karls Universität Tübingen
Germany (DE)
Lomonosov Moscow State University / Московский государственный университет имени М.В.Ломоносова
Russian Federation (RU)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
Institute of Astronomy (INASAN) / Federal State Institution of Science Institute of Astronomy of the Russian Academy of Sciences
Russian Federation (RU)
Germany (DE)
Lomonosov Moscow State University / Московский государственный университет имени М.В.Ломоносова
Russian Federation (RU)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
Institute of Astronomy (INASAN) / Federal State Institution of Science Institute of Astronomy of the Russian Academy of Sciences
Russian Federation (RU)
How to cite
APA:
Shakura, N., Kolesnikov, D., Postnov, K., Volkov, I., Bikmaev, I., Irsmambetova, T.,... Klochkov, D. (2019). On the nature of the 35-day cycle in the X-ray binary Her X-1/HZ Her. In High-mass X-ray Binaries: Illuminating the Passagefrom Massive Binaries to Merging Compact Objects. (pp. 281-287). Cambridge University Press.
MLA:
Shakura, N., et al. "On the nature of the 35-day cycle in the X-ray binary Her X-1/HZ Her." High-mass X-ray Binaries: Illuminating the Passagefrom Massive Binaries to Merging Compact Objects. Cambridge University Press, 2019. 281-287.
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