Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..55h&link_type=abstract
On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re
Astronomy and Astrophysics
Astronomy
Scientific paper
PSR B1259-63, a rotation-powered radio pulsar with a ~48 millisecond period, is in a highly eccentric (e~0.87) 3.4 year orbit around a massive Be star SS 2883. We report the results of the XMM-Newton observations performed between 2001 and 2004. Combining the XMM-Newton observations with the previous results from ASCA, we found that the best-fit power-law models in 1.0-10.0 keV energy band show long term variations in the photon indices from ~1.11 to ~1.95. The X-ray flux is observed to increase by a factor of > 10 at perisatron to apastron. No X-ray pulsation at the pulsar's spin period was found in any observations so far. A model invoking the interaction between the pulsar and the stellar wind is likely to explain the observed orbital phase-dependent time variability in the X-ray flux and spectrum.
Becker Walter
Huang Haifeng
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