Changing orientation of dipole and spin axes in binary X-ray pulsars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Binary Stars, Neutron Stars, Pulsars, Stellar Rotation, X Ray Sources, X Ray Stars, Magnetic Dipoles, Plasma Interactions, Secular Variations, Spin Dynamics, Stellar Magnetic Fields, Stellar Winds

Scientific paper

It is shown that the inclination angle between the dipole and spin axes of a neutron star in an X-ray binary system should increase during spinup episodes and decrease during spindown, on a timescale comparable with the change in spin period. This will lead to secular variations in the pulse shapes, and, under the assumption that a typical X-ray pulsar has spun down on net during its history of interaction with its mass-losing companion, may account for an apparent preponderance of 'single-pulse' profiles.

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