The variable iron line in Cygnus X-3

Details The variable iron line in Cygnus X-3 The variable iron line in Cygnus X-3

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..297v&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

8

Iron, Line Spectra, Spaceborne Astronomy, X Ray Binaries, Cygnus Constellation, Emission Spectra, Exosat Satellite, Orbital Elements, Periodic Variations, Proportional Counters, Pulsars, Scintillation Counters, Spectral Energy Distribution, Stellar Orbits

Scientific paper

Cygnus X-3 was observed with the GSPC on board Exosat on several occasions, one observation lasting for seven orbital cycles. The width W and centroid energy E of the iron emission feature near 6.7 keV show a smooth, correlated, sinusoidal-type modulation, the iron line being widest and E being lowest just before X-ray maximum. The line profile may show a low-energy wing, but apart from this does not deviate strongly from a symmetric, Gaussian-type shape. The continuum at higher energies than the line is not completely smooth, but shows 'bumps' which remain stable in time. Two possible explanations are discussed for the correlated variation of E and W as a function of orbital phase.

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