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The hydrodynamics of the interaction of pulsar and stellar winds in binarysystems harboring a pulsar and its impact on the nonthermal radiation of thebinary pulsar PSR B1259-63/SS2883 is discussed. The collision of anultrarelativistic pulsar wind with a nonrelativistic stellar outflow results insignificant bulk acceleration of the shocked material from the pulsar wind.Already at distances comparable to the size of the binary system, the Lorentzfactor of the shocked flow can be as large as $\gamma$~4. This results insignificant anisotropy of the inverse Compton radiation of acceleratedelectrons. Because of the Doppler boosting of the produced radiation, oneshould expect a variable gamma-ray signal from the system. In particular, thiseffect may naturally explain the reported tendency of a decrease of TeVgamma-ray flux close to the periastron. The modeling of the interaction ofpulsar and stellar winds allows self-consistent calculations of adiabaticlosses. Our results show that adiabatic losses dominate over the radiativelosses. These results have direct impact on the orbital variability of radio,X-ray and gamma-ray signals detected from the binary pulsar PSR 1259-63/SS2883.

Hydrodynamics of interaction of pulsar and stellar winds and its impact on the high energy radiation of binary pulsar systems