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We analyze the model of gamma-ray binaries, consisting of a massive star anda pulsar with ultrarelativistic wind. We consider radiation from energeticparticles, accelerated at the pulsar wind termination shock, and feedback ofthis radiation on the wind through production of secondary electron-positronpairs. We show that the pair feedback limits the Lorentz factor of the pulsarwind and creates a population of very energetic pairs, whose radiation may beresponsible for the observed gamma-ray signal.

A model for gamma-ray binaries, based on the effect of pair production feedback in shocked pulsar winds