Observation of a line feature in the X-ray spectrum of Cygnus X-3

Astronomy and Astrophysics – Astronomy

Scientific paper

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Spaceborne Astronomy, Spectral Energy Distribution, Spectrum Analysis, X Ray Spectra, X Ray Stars, Radiant Flux Density, Spectral Line Width

Scientific paper

A narrow emission feature at about 6.5 keV has been detected in the spectrum of Cygnus X-3, using instrumentation on the Ariel-5 satellite. The average strength of the feature is 0.027 plus or minus 0.004 photon sq cm per sec. The strength varies with the phase of the 4.8-hr binary cycle, but is the same as that seen by Serlemitsos et al. (1975) when the overall source intensity was much lower.

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