Multi-frequency long-term observations of her X-1 — The 35-d cycle
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: Conference contribution
Publication year: 2019
Journal
Publisher: Sissa Medialab Srl
Book Volume: 362
Conference Proceedings Title: Proceedings of Science
Event location: Palermo, ITA
Abstract
In this work are presented the results of modelling of 35d superorbital changes of B and V lightcurves and X-ray flux of HZ Her/Her X-1. The model implemented in the new code written in C programming language, with 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 X-ray emission flux from the neutron star also depends on the free precession phase which modulates the X-ray illumination of the optical star atmosphere and the intensity of gas streams. We demonstrate that this model is able to well reproduce both optical observations of HZ Her and the behaviour of the 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)
Kazan (Volga region) Federal University / Казанский (Приволжский) федеральный университет
Russian Federation (RU)
Eberhard Karls Universität Tübingen
Germany (DE)
Institute of Astronomy (INASAN) / Federal State Institution of Science Institute of Astronomy of the Russian Academy of Sciences
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)
Institute of Astronomy (INASAN) / Federal State Institution of Science Institute of Astronomy of the Russian Academy of Sciences
Russian Federation (RU)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
How to cite
APA:
Shakura, N., Kolesnikov, D., Postnov, K., Volkov, I., Bikmaev, I., Irsmambetova, T.,... Klochkov, D. (2019). Multi-frequency long-term observations of her X-1 — The 35-d cycle. In Proceedings of Science. Palermo, ITA: Sissa Medialab Srl.
MLA:
Shakura, N., et al. "Multi-frequency long-term observations of her X-1 — The 35-d cycle." Proceedings of the 13th Frascati Workshops on "Multifrequency Behaviour of High Energy Cosmic Sources", MULTIF 2019, Palermo, ITA Sissa Medialab Srl, 2019.
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