Some observational tests for possible models of HER X-1-type objects Pulse shape and polarization

Astronomy and Astrophysics – Astronomy

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Astronomical Models, Binary Stars, Neutron Stars, Pulsed Radiation, Stellar Rotation, X Ray Stars, Gamma Rays, Magnetic Effects, Magnetic Stars, Pencil Beams, X Ray Astronomy

Scientific paper

Various models have already been proposed for the binary X-ray source Her X-1 and at the present stage there is no general agreement as regards the specific nature of the source. The present paper shows that a pencil-beam model of a rotating magnetic neutron star offers a natural explanation for the existing observational data of Her X-1. In hard X-ray and gamma-ray regions some basic changes in pulse shapes (broadening, disappearance, or even a switchover to fan beams) are predicted by this model. Further observational tests are discussed. The most conclusive tests are suggested to be the polarization experiments by which the correct model can be determined.

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