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Nonpulsed but variable X-ray emission has been detected from the binary system containing the radio pulsar PSR 1259{63 during two pointed ROSAT observations, taken flve months apart. This 47.7 ms radio pulsar is in a highly eccentric (†» :85) binary system with the 10 to 15 Mfl Be star SS2883. It is the flrst radio pulsar found to be in a binary system with a massive main sequence companion; it is also the most highly eccentric binary system known to contain a neutron star. The level of X-ray ∞ux detected in the ROSAT observations has increased with orbital phase by a factor of at least ten between 1992 February and 1993 February. The X-ray ∞ux is signiflcantly greater than expected from the Be star's corona and seems likely to originate either from low-level stellar wind accretion onto the neutron star or from the shock between the stellar wind and the relativistic pulsar wind. The system may be the progenitor of the more slowly rotating Be X-ray binary pulsar systems.

Detection of X-ray emission from the PSR 1259-63/SS 2883 binary system