Secular period changes in X-ray pulsators

Astronomy and Astrophysics – Astronomy

Scientific paper

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Pulsars, Secular Variations, Stellar Mass Accretion, Stellar Models, X Ray Sources, Angular Momentum, Long Term Effects, Neutron Stars, Stellar Luminosity

Scientific paper

Data on secular period changes in pulsating X-ray sources are compared with the rates predicted due to accretion torques on a spinning, magnetized compact object. It is found that the measurements agree with prediction if the compact object is assumed to be a neutron star. Such information can therefore be used, for example, as a distance indicator for these sources, and also to deduce the accretion rate in pulsating transient sources during their 'low' emission phases.

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