Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207..902m&link_type=abstract
Astrophysical Journal, vol. 207, Aug. 1, 1976, pt. 1, p. 902-906.
Astronomy and Astrophysics
Astrophysics
8
Binary Stars, Line Spectra, Optical Emission Spectroscopy, Photosphere, Stellar Spectra, X Ray Binaries, X Ray Stars, Eclipsing Binary Stars, Emission Spectra, Helium, Pulsars, Radial Velocity, Radiant Flux Density, Temperature Inversions
Scientific paper
It is suggested that the optical emission lines in spectra of X-ray binaries can originate from the surface of the nondegenerate member. This is an alternative to the picture in which the emission lines come from the vicinity of the compact member of the system. The emission lines are due to a temperature inversion in the photosphere which is induced by X-ray heating. The inverted phase of the emission velocity curves and the observed 'eclipse' of the lines are explained. Individual systems are discussed. In some cases a small soft X-ray flux is assumed. A few ways to test this suggestion observationally are pointed out.
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