  Timing analisys of PSR 1259-63 during its recent periastron passage suggested
that the pulsar was spinning-down due to the propeller mechanism (Manchester et
al. 1995). This requires that the radio pulsar mechanism is temporarily
quenched. On the basis of the Be equatorial disk model derived from the
dispersion and rotation measures analysis (Melatos et al. 1995), we show that
the mass inflow is sufficiently high to yield accretion down to the
magnetospheric radius. In this case the X-ray spectrum might result from the
propeller shock emission.
