Shortening of the period of binary X-ray pulsars as an indicator of the evolution of the normal components

Details Shortening of the period of binary X-ray pulsars as an indicator of the evolution of the normal components Shortening of the period of binary X-ray pulsars as an indicator of the evolution of the normal components

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sval....3..114s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 3, May 1977, p. 216-219.) Soviet Astronomy Letters, vol. 3, May-June 1977, p. 114-116.

Astronomy and Astrophysics

Astronomy

3

Binary Stars, Pulsars, Stellar Evolution, X Ray Stars, Angular Velocity, Magnetospheres, Mass Transfer, Momentum Transfer, Neutron Stars, Stellar Magnetic Fields, Stellar Mass

Scientific paper

It is noted that the observed spinups of the accreting binary X-ray pulsars Her X-1, Cen X-3, and SMC X-1 most likely reflect a slow increase in their accretion rates as well as in the mass-loss rates of their main-sequence companions, so that observations of the period derivatives should contain information about the rate of evolution of the normal components in these systems. The transfer of angular momentum in an accretion disk and the rate of change in the rotational velocity of a neutron star are analyzed for cases where a viscous boundary layer exists near the Alfven surface, a large centrifugal barrier near the Alfven surface obstructs accretion, and matter near the Alfven surface corotates with the pulsar. Based on the results obtained, it is concluded that Her X-1, Cen X-3, and SMC X-1 function in a mode close to corotation. Characteristic times for changes in stellar parameters are estimated for HZ Her and Krzeminski's star.

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