The model of the 35-day cycle in the binary X-ray source HER X-1

Details The model of the 35-day cycle in the binary X-ray source HER X-1 The model of the 35-day cycle in the binary X-ray source HER X-1

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67...85b&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 85-98. In Russian.

Statistics

Computation

2

Computational Astrophysics, Neutron Stars, Stellar Models, X Ray Binaries, Accretion Disks, Light Curve, Stellar Rotation

Scientific paper

Consideration is given to a model with a freely precessing neutron star for the explanation of the 35-day cycle in the X-ray pulsar Her X-1. The formula is deduced for the variation of the observed period of the pulsar during this precession. It is obtained that a rotating magnetized neutron star, as a rule, has a form of either aligned symmetrical top or three-axial figure, and the formation of the inclined symmetrical top is very problematic. It is shown that many peculiarities of the shape variation of the pulse, observed during the 35-day cycle, cannot be explained in the model of a freely precessing neutron star, but can be explained in the model of a precessing accretion disk with the distance between its inner boundary and stellar surface equal to 10 stellar radii.

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