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

DOI: 10.1093/mnras/staa2829

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

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://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.

BibTeX: Download