Cygnus X-3 light-curve model in the TeV energy region

Details Cygnus X-3 light-curve model in the TeV energy region Cygnus X-3 light-curve model in the TeV energy region

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..681m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. 681-685.

Astronomy and Astrophysics

Astronomy

17

Eclipsing Binary Stars, Gamma Ray Astronomy, Light Curve, Stellar Models, X Ray Binaries, Stellar Orbits, Stellar Physics

Scientific paper

We consider a close binary system containing a compact object and suggest that very high-energy (VHE) gamma-rays are produced near this object. In such a system the VHE gamma-rays have to interact with soft photons around the companion star by gamma-gamma - ee reactions. These soft photons have a radial distribution, so the VHE gamma-rays will reach the observer when their source lies between the companion star and the observer, because the reaction is impossible if the angle between the momenta of soft photon and gamma-quantum is small. In this model the VHE gamma-ray light curve has a sharp maximum at the orbital phase region 0.2-0.8 for orbits with various orientations and eccentricities. Our calculations show that for the orbital parameters of Cygnus X-3 the light-curve maximum occurs at phase about 0.6, which is in agreement with recent experimental data.

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