Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17065l&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
A new model for pulsed emission from rotating accreting neutron stars is presented. This model considers asymmetrically-filled accretion columns extending above the neutron star polar caps. The geometry which is modelled is expected to result from an accretion flow onto the magnetosphere of the pulsar, and is described by a few basic parameters. The model uses the local emission from published magnetic-radiative transfer calculations as input. The output is the x-ray pulse shape at various energies, as a function of the parameters of the accretion flow geometry. The effects of gravitational light bending are included, and have a major impact on the resulting pulse shapes. The model also incorporates a non-linear least-squares fitting routine so that model parameters can be derived from an observed pulse profile. Example pulse shapes for specified geometries will be presented as well as some results of fitting observed pulse profiles.
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