The equilibrium of Hercules X-1

Details The equilibrium of Hercules X-1 The equilibrium of Hercules X-1

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64..321l&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, Mar.-Apr. 1987, p. 321-325. In Russian.

Physics

3

Equilibrium, Pulsars, Stellar Physics, X Ray Sources, Stellar Luminosity, Stellar Models, Stellar Rotation, Torque

Scientific paper

The character of period changes for X-ray pulsars is considered. In the case of disk accretion a pulsar turns out to attain a state of catastrophic equilibrium. The analysis is given for the pulsar Her X-1. The period change observed by the Japanese team for this pulsar in the last years is interpreted in terms of a simple analytical model of accelerating and braking torques. It is asserted that there must be a great dynamical range of luminosities (100 - 1000 times as less than the mean value) in which the spin-down rate remains constant.

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