Accretion torques in X-ray pulsars


The character of intrinsic pulse period changes in X-ray pulsars supports the now conventional model for these sources, wherein the X-ray luminosity is derived from the accretion of matter on to a rotating, magnetised compact object, probably a neutron star, and the pulse period changes are caused by its interaction with the accreting matter. 
DOI: 10.1038/266683a0


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