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Institut für Astronomie und Astrophysik

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Preprint 16/06

A precessing warped accretion disk around the X-ray pulsar Her X-1

D. Klochkov (1), N. Shakura (2), K. Postnov (2), R. Staubert (1), J. Wilms (3)

(1) Institute für Astronomie und Astrophysik, Univ. Tübingen
(2) Sternberg Astronomical Institute, Lomonossov Univ. Moscow
(3) Dr. Remeis-Sternwarte Bamberg, Univ. Erlangen

To be published in: Proceedings of the 363. WE-Heraeus Seminar on: Neutron Stars and Pulsars, Physikzentrum Bad Honnef, Germany, May.14-19, 2006

Abstract. We have performed an analysis and interpretation of the X-ray light curve of the accreting neutron star Her X-1 obtained with the ASM RXTE over the period 1996 February to 2004 September. The averaged X-ray light curves are constructed by means of adding up light curves corresponding to different 35 day cycles. A numerical model is introduced to explain the properties of the averaged light curves. We argue that a change of the tilt of the accretion disk over the 35 day period is necessary to account for the observed features and show that our numerical model can explain such a behavior of the disk and reproduce the details of the light curve.

Astrophysics (astro-ph): astro-ph/0612790

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