Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..188l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 188-193. Research supported by N
Astronomy and Astrophysics
Astronomy
17
Emission Spectra, Pulsars, X Ray Binaries, X Ray Sources, Least Squares Method, Neutron Stars, Stellar Models, X Ray Astronomy
Scientific paper
Observed X-ray pulsar profiles are analyzed by fitting to model pulse profiles. A polar-cap emission model for X-rays emitted by accreting neutron stars is constructed using the local X-ray intensity distribution for radiation from a magnetized plasma. Model pulse profiles are computed from the intensity distribution from a filled or annular polar-cap emission region and fitted by least squares to observed pulse profiles of 15 X-ray pulsars. The mean angle between the rotation and magnetic axis is found to be about 24 deg, much smaller than that expected for random orientations. Nine of the 15 X-ray pulsars have profiles which indicate annular shaped polar-cap emission regions.
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