A model of the Cygnus X-3 system in the gamma-rays region

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gamma Ray Spectra, Stellar Models, X Ray Binaries, Companion Stars, Light Curve, Stellar Atmospheres

Scientific paper

A model to explain the Cyg X-3 light curve in the TeV energy region is proposed. In the model, very high energy (VHE) gamma rays are produced near the compact object by the process of photoproduction and photodisintegration of nuclei. The VHE gamma-ray light curve has a sharp maximum in the orbital phase region 0.2-0.8, depending on the orientation and eccentricity of the orbit. It is shown that for Cygnus X-3 orbital parameters the light curve maximum lies at a phase of about 0.6, in agreement with recent observational data. In the model the nonperiodic variability and redistribution of VHE gamma rays will be caused by variations of soft photons coming from the companion star. Simultaneous EGRET and ground-based observations will make it possible to check the predictions of the present model.

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