The 35-day cycle in the X-ray binary HZ Her/Her X-1
Kolesnikov D, Shakura N, 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 (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 50
Pages Range: 518-520
Journal Issue: 2
DOI: 10.31577/caosp.2020.50.2.518
Abstract
We present the results of modelling the 35-day superorbital changes in the B and V lightcurves and X-ray flux of HZ Her/Her X-1. The model is implemented in a computer program written in the C programming language, with a module for parameter optimisation written in Python. The model includes a tilted precessing and warped accretion disc around a freely precessing neutron star. The disc is warped near its inner edge due to interaction with the rotating neutron star magnetosphere. The magnetic torque depends on the precessional phase of the neutron star. The neutron star X-ray emission flux also depends on the free precession phase, which modulates the X-ray illumination of the optical star's atmosphere and the intensity of gas streams. We demonstrate that this model is able to reproduce both the optical observations of HZ Her and the behaviour of the system's 35-day X-ray cycle.
Authors with CRIS profile
Involved external institutions
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)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
Eberhard Karls Universität Tübingen
Germany (DE)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
Russian Federation (RU)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
Eberhard Karls Universität Tübingen
Germany (DE)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
How to cite
APA:
Kolesnikov, D., Shakura, N., Postnov, K., Volkov, I., Bikmaev, I., Irsmambetova, T.,... Klochkov, D. (2020). The 35-day cycle in the X-ray binary HZ Her/Her X-1. Contributions of the Astronomical Observatory Skalnate Pleso, 50(2), 518-520. https://dx.doi.org/10.31577/caosp.2020.50.2.518
MLA:
Kolesnikov, D., et al. "The 35-day cycle in the X-ray binary HZ Her/Her X-1." Contributions of the Astronomical Observatory Skalnate Pleso 50.2 (2020): 518-520.
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