Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..955k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 955-960.
Astronomy and Astrophysics
Astrophysics
62
Accretion Disks, K Lines, Stellar Spectra, X Ray Binaries, Compton Effect, Iron, Spectral Line Width, Stellar Coronas
Scientific paper
Models are presented for the 6-7 keV iron line emission from low-mass X-ray binaries. A simplified model for an accretion disk corona is used to examine the dependence of the observable line properties, line width and mean energy, on the radial distance of the emission region from the X-ray source, and on the fraction of the X-rays from the source which reach the disk surface. The effects of blending of multiple line components and of Comptonization of the line profile are included in numerical calculations of the emitted profile shape. The results of these calculations, when compared with the line properties observed from several low-mass X-ray binaries, suggest that the broadening is dominated either by rotation or by Compton scattering through a greater optical depth than is expected from an accretion disk corona.
Kallman Tim
White Nicholas E.
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