SIMBAD references

2020MNRAS.499.1747K - Mon. Not. R. Astron. Soc., 499, 1747-1757 (2020/December-1)

Modelling of 35-d superorbital cycle of B and V light curves of IMXB HZ Her/Her X-1.

KOLESNIKOV D.A., SHAKURA N.I., POSTNOV K.A., VOLKOV I.M., BIKMAEV I.F., IRSMAMBETOVA T.R., STAUBERT R., WILMS J., IRTUGANOV E., GOLYSHEVA P.Y., SHUGAROV S.Y., NIKOLENKO I.V., TRUNKOVSKY E.M., SCHONHERR G., SCHWOPE A. and KLOCHKOV D.

Abstract (from CDS):

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.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - X-rays: binaries - X-rays: individual: Her X-1

Simbad objects: 1

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