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We study the interaction between the Be star and the pulsar in the TeV binaryPSR B1259-63/LS 2883, using 3-D SPH simulations of the tidal and windinteractions in this Be-pulsar system. We first run a simulation without pulsarwind nor Be wind, taking into account only the gravitational effect of thepulsar on the Be disk. In this simulation, the gas particles are ejected at aconstant rate from the equatorial surface of the Be star, which is tilted in adirection consistent with multi-waveband observations. We run the simulationuntil the Be disk is fully developed and starts to repeat a regular tidalinteraction with the pulsar. Then, we turn on the pulsar wind and the Be wind.We run two simulations with different wind mass-loss rates for the Be star, onefor a B2V type and the other for a significantly earlier spectral type.Although the global shape of the interaction surface between the pulsar windand the Be wind agrees with the analytical solution, the effect of the pulsarwind on the Be disk is profound. The pulsar wind strips off an outer part ofthe Be disk, truncating the disk at a radius significantly smaller than thepulsar orbit. Our results, therefore, rule out the idea that the pulsar passesthrough the Be disk around periastron, which has been assumed in the previousstudies. It also turns out that the location of the contact discontinuity canbe significantly different between phases when the pulsar wind directly hitsthe Be disk and those when the pulsar wind collides with the Be wind. It isthus important to adequately take into account the circumstellar environment ofthe Be star, in order to construct a satisfactory model for this prototypicalTeV binary.

Hydrodynamic Interaction between the Be Star and the Pulsar in the TeV Binary PSR B1259-63/LS 2883