Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..203l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 203-212. NSERC-supported researc
Astronomy and Astrophysics
Astronomy
33
Neutron Stars, Pulsars, Stellar Mass Accretion, X Ray Sources, Accretion Disks, Astronomical Models, Least Squares Method, Stellar Luminosity
Scientific paper
Polar cap emission models for X-ray emitted by accreting neutron stars are constructed and compared to observed pulse profiles. This work is a generalization of the work of Leahy (1990). The intensity distribution from the neutron star is computed using a source region consisting of two annular polar-cap emission regions. These annuli are centered on the magnetic poles which are allowed to be offset from a single axis passing through the center of the neutron star. Model profiles are generated from the calculated intensity distribution, then are least-squares fitted to the observed pulse profiles of 20 X-ray pulsars. Parameters such as orientation of neutron star spin and magnetic axes, polar cap size, and magnetic axis offset are derived. Results from the modeling include: nearly half the pulsars require an offset; only one pulsar requires the two polar caps to be of different size; the mean angle between spin and magnetic axes is of about 27 deg; no correlation is found between polar-cap size and pulse period or luminosity.
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