VLBI monitoring of the periastron passage of PSR B1259-63

Mathematics – Logic

Scientific paper

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Pulsars, Neutron Stars, Compact Binaries And/Or Black-Holes, Lba

Scientific paper

PSR B1259-63 (PSR J1302-6350) is a 48 ms pulsar in orbit around a B2Ve companion star in a highly eccentric orbit with a period of 3.4 years. During the periastron passage the system displays non-thermal emission from radio to very high energy gamma rays, produced by the interaction between the stellar wind and/or the dense equatorial disc of the Be star with the pulsar wind. It is one of the three galactic binary systems detected at TeV energies, together with LSI +61 303, and LS 5039. These two systems show morphological and astrometrical variability in their radio emission, although it has not been possible to detect the pulsed emission. We propose to observe PSR B1259-63 with the LBA to trace for the first time the evolution of the radio nebula and the pulsar emission simultaneously. Accurate modelling of the evolution of the compact radio emission would allow us to deeply understand this peculiar system, and constrain some physical parameters: the stellar wind density and velocity, the magnetic field of the nebula, the magnetization of the pulsar, and constrain the inclination of the system.

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