Variable spectrum of the X-Ray pulsar RX J0720.4-3125

Details Variable spectrum of the X-Ray pulsar RX J0720.4-3125 Variable spectrum of the X-Ray pulsar RX J0720.4-3125

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hrxs.confe..21h&link_type=abstract

"High Resolution X-ray Spectroscopy: Towards IXO, Proceedings of the international workshop held at the Mullard Space Science La

Physics

Scientific paper

RX J0720.4-31.25 is one of seven radio quiet, isolated neutron stars (often called the magnificent seven) with similar properties discovered during the ROSAT all-sky survey. The X-ray spectrum can be modelled with a blackbody and an gaussian absorption feature. This neutron star does not only show a short periodic variability - its spin period (P=8.3911153s), but also a long term variability in its spectral parameters (see de Vries et al., 2004; Vink et al., 2004; Haberl et al., 2006 and Hohle et al., 2009), i.e. its temperature, size of the emitting area and equivalent width of the absorption feature and a long term variability of its Period. The reason of this behaviour is still unknown, but might be evidence for precession or a glitch event around MJD=52800 days (Haberl et al., 2006 & Kerkwijk et al., 2007). Furthermore, there is an indication for an absorption line from highly ionised oxygen in the RGS spectra (Hambaryan et al., submitted).

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