Modelling of 35-d superorbital cycle of B and V light curves of IMXB HZ Her/Her X-1
Kolesnikov DA, Shakura N, Postnov KA, Volkov IM, Bikmaev IF, Irsmambetova TR, Staubert R, Wilms J, Irtuganov E, Golysheva PY, Shugarov SY, Nikolenko I, Trunkovsky EM, Schoenherr G, Schwope A, Klochkov D (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 499
Pages Range: 1747-1757
Journal Issue: 2
Abstract
The X-ray binary Her X-1 consists of an accreting neutron star and the optical component HZ Her. The 35-d X-ray superorbital 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 a warped accretion disc tilted to the orbital plane. We argue that the observed features of the 35-d optical variability of HZ Her can be explained by free precession of the neutron star with a period close to that of the forced disc. The model parameters include (a) the X-ray luminosity of the neutron star; (b) the optical flux from the accretion disc; and (c) the tilt of the inner and outer edges of the accretion disc. 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.
Authors with CRIS profile
Involved external institutions
Lomonosov Moscow State University / Московский государственный университет имени М.В.Ломоносова
Russian Federation (RU)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
Eberhard Karls Universität Tübingen
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
Russian Federation (RU)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
Eberhard Karls Universität Tübingen
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
How to cite
APA:
Kolesnikov, D.A., Shakura, N., Postnov, K.A., Volkov, I.M., Bikmaev, I.F., Irsmambetova, T.R.,... Klochkov, D. (2020). Modelling of 35-d superorbital cycle of B and V light curves of IMXB HZ Her/Her X-1. Monthly Notices of the Royal Astronomical Society, 499(2), 1747-1757. https://dx.doi.org/10.1093/mnras/staa2829
MLA:
Kolesnikov, D. A., et al. "Modelling of 35-d superorbital cycle of B and V light curves of IMXB HZ Her/Her X-1." Monthly Notices of the Royal Astronomical Society 499.2 (2020): 1747-1757.
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