HZ Her/Her X-1 - an alternative model for the 35d cycle?

Details HZ Her/Her X-1 - an alternative model for the 35d cycle? HZ Her/Her X-1 - an alternative model for the 35d cycle?

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140l..35m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. L35-L38.

Astronomy and Astrophysics

Astrophysics

39

Accretion Disks, Binary Stars, Neutron Stars, X Ray Sources, Stellar Evolution, Stellar Mass Accretion, Stellar Models

Scientific paper

Self-irradiated accretion disks around neutron stars with the appropriate surface temperatures perform long scale cyclic variations of their disk structure. For a constant mass overflow rate from the secondary, this implies that disk thickness and mass accretion rate onto the central object vary periodically. When the observer is sufficiently close to the equatorial plane, this leads to periodic obscurations of the central X-ray source and thereby provides an alternative model for the 35-day cycle of the HZ Her/Her X-1 light curve. The model may thereby explain a series of apparently contradictory, but crucial, observations. It is emphasized that although the model's essential mechanism operates in an azimuthally symmetric disk, the outer rim structure of the accretion disk cannot be azimuthally symmetric, due to the appearance of tidal mountains.

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