Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..207r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 207-217. DFG-supported research.
Astronomy and Astrophysics
Astrophysics
47
Gravitational Effects, Light Beams, Neutron Stars, Pulsars, Relativity, X Ray Binaries, Schwarzschild Metric, Stellar Mass Accretion
Scientific paper
The beam shapes, pulse profiles, and spectral transmission function at infinity for the radiation originating in columns or hot spots on slowly rotating neutron stars, represented by the Schwarzschild metric, are calculated. These are used for models for binary accreting pulsars and may apply to isolated neutron stars as well. The shadowing effects and their interplay with the frequency changes as a function of the observer angle are discussed. The observed bolometric beam shapes and pulse profiles are given as a function of radius, as well as observed pulse-phase spectra and frequency-dependent pulse profiles, for various types of source functions at the surface. The more realistic accretion (or emission) column geometry used indicates that these may show a larger degree of modulation than was previously thought, as compared to hot spots. The observational implications for X-ray-emitting pulsars are discussed.
Meszaros Peter
Riffert Harald
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