  PSR B1259-63 is the only known binary system with a radio pulsar from which
the non-pulsed radio and X-ray emission was detected. The companion star in
this system is a Be star SS 2883. A rapidly rotating radio pulsar is expected
to produce a wind of relativistic particles. Be stars are known to produce
highly asymmetric mass loss. Due to the interaction of the pulsar wind and the
Be star wind the system of two shocks between the pulsar and the Be star forms.
In this paper we show that the observed non-pulsed radio emission from the
system is a result of the synchrotron emission of the relativistic particles in
the outflow beyond the shock wave and that the non-pulsed X-ray emission is due
to the inverse Compton scattering of the Be star photons on this particles.
