Gravitational light bending near neutron stars. II - Accreting pulsar spectra as a function of phase

Details Gravitational light bending near neutron stars. II - Accreting pulsar spectra as a function of phase Gravitational light bending near neutron stars. II - Accreting pulsar spectra as a function of phase

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..712m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 712-722. DFG-supported research.

Other

26

Accretion Disks, Gravitational Lenses, Neutron Stars, Pulsars, Stellar Rotation, X Ray Binaries, Cyclotron Radiation, Interstellar Magnetic Fields, Magnetic Stars, Radiative Transfer, Relativistic Theory

Scientific paper

This paper presents X-ray pulse shapes and phase-dependent cyclotron spectra of simple accretion column and accretion cap models of rotating magnetized neutron stars, including general relativistic light-bending effects. It is shown that the latter effects can be strong, and the beaming properties and phase-dependent spectral properties are discussed as a function of the stellar radius, using realistic magnetized input spectra. It is also shown that a qualitatively correct fit to the observations of Her X-1 can be obtained only in two situations: either the accretion is of the cap type and the neutron star radius is larger than about four Schwarzschild radii, or else the accretion is of the column type and the neutron star radius is of the order of 1.6 Schwarzschild radii. On the basis of various theoretical arguments and the current status of other evidence, the latter seems indicated at present.

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