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Title:
A 4.8 hour periodicity in the spectra of Cygnus X-3
Authors:
Becker, R. H.; Robinson-Saba, J. L.; Pravdo, S. H.; Boldt, E. A.; Holt, S. S.; Serlemitsos, P. J.; Swank, J. H.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt; Maryland, University, College Park, Md.), AB(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt; Maryland, University, College Park, Md.), AC(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt; Maryland, University, College Park, Md.), AD(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AE(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AF(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AG(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 224, Sept. 15, 1978, p. L113-L117. (ApJL Homepage)
Publication Date:
09/1978
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Astronomical Spectroscopy, Binary Stars, Periodic Variations, Stellar Models, X Ray Sources, X Ray Spectra, Bremsstrahlung, Compton Effect, Light Curve, Line Spectra, Photoelectric Emission, Stellar Winds, Variable Stars, X Ray Scattering, X Ray Spectroscopy
DOI:
10.1086/182772
Bibliographic Code:
1978ApJ...224L.113B

Abstract

The X-ray binary Cyg X-3 has been observed on three occasions during 1975 and 1976 by the GSFC Cosmic X-Ray Spectroscopy Experiment on OSO 8. The X-ray spectra from all three observations 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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