We show that TeV gamma-ray emission produced via interactions of high-energyparticles with anisotropic radiation field of a massive star in binary systemsshould have a characteristic rotating hollow cone anisotropy pattern. Thehollow cone, whose axis is directed away from the massive star, rotates withthe period equal to the orbital period of the system. We note that the twomaxima pattern of the TeV energy band lightcurve of the gamma-ray loud binaryLS 5039 can be interpreted in terms of this rotating hollow cone model.Adopting such an interpretation, we are able to constrain the geometry of thesystem - either the inclination angle of the binary orbit, or the elevation ofthe gamma-ray emission region above the orbital plane.
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