A 4.8 hour periodicity in the spectra of CYG X-3

Details A 4.8 hour periodicity in the spectra of CYG X-3 A 4.8 hour periodicity in the spectra of CYG X-3

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7828023b&link_type=abstract

Presented at the 152d Am. Astronom. Soc. Meeting, Madison, Wis., 24-28 Jun. 1978

Astronomy and Astrophysics

Astronomy

Binary Stars, Cygnus Constellation, Emission Spectra, Periodic Variations, X Ray Sources, X Ray Spectroscopy, Iron, Line Spectra, Oso-8, Spectrum Analysis, X Ray Astronomy

Scientific paper

The X-ray spectra from three observations of the X-ray binary Cyg X-3 by the cosmic X-ray spectroscopy experiment on OSO can be represented by power-law continua with strong iron line emission. Comparisons of spectra taken within the same observation at various phases of the 4.8 hour period reveal a relative excess of low energy X-ray emission near zero phase (i.e. the minimum) of the 4.8 hour modulation. In addition, the centroid of the line emission is observed to vary in phase with the 4.8 hour cycle. The possibility of persistent thermal X-ray emission from material surrounding the binary system is introduced in an effort to account for the observed effects.

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