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Name:Marc Ribo


Institution:Universitat de Barcelona


Country:Spain




Title:The extended and variable radio structure of the gamma-ray binary PSR B1259-63/LS 2883




Abstract:PSR B1259-63 is a 48 ms pulsar in a highly eccentric 3.4-year orbit around the young massive O8.5Ve star LS 2883. During the periastron passage the system displays transient non-thermal unpulsed emission from radio to very high energy gamma rays. It is one of the three galactic binary systems clearly detected at TeV energies, together with LS 5039 and LS I +61 303. I will present the 3-epoch VLBI observations obtained with the Australian Long Baseline Array around the 2007 periastron passage that show, for the first time, extended and variable radio structure, and will discuss their implications. This is the first observational evidence that non-accreting pulsars orbiting massive stars can produce variable extended radio emission at AU scales. I will also present preliminary results of our 5-epoch VLBI observations obtained around the 2010 periastron passage, and will introduce our long-term astrometric project to monitor the orbit of the pulsar, the binary system proper motion and its parallax.








            

            
            

              

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