The importance of accretion torques in pulsing X-ray sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Mass Transfer, Neutron Stars, Pulsars, Torque, X Ray Stars, Angular Momentum, Moments Of Inertia, Stellar Evolution, Stellar Magnetic Fields, Stellar Motions, Stellar Structure, X Ray Sources

Scientific paper

We compare the rates of change of pulse period, of a binary X-ray source, due to accretion torques and due to orbital motion. We show that these rates of change can be comparable, in particular for the sources with pulse periods of a few minutes. For this reason orbital parameters derived for pulsing transient sources may be subject to gross errors. Conversely, once the orbital motion is known, conclusions can be drawn about the structure of the neutron star itself.

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