Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jphys..49...47m&link_type=abstract
(IAU, ESA, CNRS, et al., Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 102nd, Beaulieu-sur-Me
Astronomy and Astrophysics
Astrophysics
1
Emission Spectra, K Lines, Metallicity, X Ray Binaries, Continuous Radiation, Ferric Ions, Radiative Recombination
Scientific paper
Emission mechanisms of the iron K(alpha)-lines in X-ray binaries are discussed in relation with the characteristic temperature T(X) of continuum radiation thereof. The 6.7 keV line is ascribed to radiative recombination followed by cascades in a corona of about 100 eV formed above the accretion disk. This mechanism is attained for T(X) not greater than 10 keV, as observed for low mass X-ray binaries. The 6.4-keV line observed for binary X-ray pulsars with T(X) greater than 10 keV is likely due to fluorescence outside the He II ionization front.
Hayakawa Saito
Masai Kuniaki
Nagase Fumiaki
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