Radiation Transfer for Linearly Anisotropic Phase Functions

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The accretion torque theory of Wang (1987) is applied to the spin periods of intermediate polars and X-ray pulsars. It is shown that, if the primaries are spinning near their equilibrium values, the range of positive and negative values of P/P observed in intermediate polars is readily understood in terms of relatively small variations of mass transfer rate M of the kind generated either by long term (~` i0~ yr) cycling of M suggested by the nova hibernation model, or by the short term (`%~ 10 yr) variations caused by magnetic cycling in the secondary stars. The variations in spin rates of the disc-fed X-ray pulsars HerX-1 and CenX-3 can also be accounted for by the latter process

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