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Astron. Astrophys. 354, 983-986 (2000)

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Research Note

Orbital phase variation of X-ray emission from Cyg X-3

K.M.V. Apparao

Department of Physics, University of Bombay, Bombay 400098, India

Received 22 September 1999 / Accepted 24 December 1999


The hard X-radiation (20-200 keV) from Cyg X-3 shows a maximum at a phase 0.5 of the observed 4.8 hr modulation, while the soft X-radiation (2-12 keV) shows a maximum at a phase 0.75.Both the emissions show a minimum at a phase 0.0. This behaviour can be explained by considering the X-ray emission both by the compact object and the hot post shock gas left by the passage of the compact object through the dense Wolf-Rayet primary; the attenuation and scattering by the electrons in the hot post shock gas, the Wolf-Rayet wind and the gas in the accretion wake is also used to construct the picture.

Key words: X-rays: stars

© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000