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29th of May 2019
LBA observations of PSR 1259-63
by Miller-Jones et al.
The pulsar/massive star binary system PSR B1259−63/LS 2883 is one of the best-studied gamma-ray binary systems. Using the Australian Long Baseline Array, Miller-Jones et al. have conducted Very Long Baseline Interferometry (VLBI) observations of PSR B1259−63 over 4.4 years, fully sampling the 3.4-year orbital period. The image above shows the motion of PSR B1259−63 on the sky over time, in both Right Ascension (top) and Declination (bottom). The motion is due to the motion of the pulsar in the binary orbit, the motion of the binary system across the sky, and the motion of the Earth around the Sun. The black line shows the best-fitting astrometric solution. The dashed and dotted vertical lines show the epochs of periastron and apastron, respectively. More details are given in the paper published in Monthly Notices of the Royal Astronomical Society.

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