Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..205f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 205-214.
Astronomy and Astrophysics
Astrophysics
3
Neutron Stars, Stellar Mass Accretion, Stellar Spectra, X Ray Binaries, Black Body Radiation, Emission Spectra, Relativistic Effects, Stellar Luminosity, Stellar Temperature, Temperature Distribution
Scientific paper
The continuum spectrum of a rotating equatorial emitting region on the surface of an accreting neutron star is investigated within the Schwarzschild spacetime. It is found that the dominant general relativistic effect is the increase in apparent emission area from the neutron star surface due to gravitational light bending. For typical neutron star parameters, the apparent area of the accretion belt is remarkably independent of the viewing angle and, hence, the contribution for a boundary layer to the total X-ray luminosity is found to depend only weakly on the inclination angle of the binary system. For a blackbody spectrum in the local rest frame of the emitting surface, the distortion of the spectral shape by longitudinal and transverse Doppler shifts is minimal for neutron stars rotating at periods greater than about 2 ms. It is shown that the failure to detect a blackbody component from the weakly magnetized neutron star surface in some X-ray burst sources during their quiescent state may be related to the presence of temperature variations along the vertical extent of the boundary layer.
Fu Albert
Taam Ronald E.
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