Discovery of complex narrow X-ray absorption features from the low-mass X-ray binary GX13+1 with XMM-Newton
L. Sidoli, A. N. Parmar, T. Oosterbroek, D. Lumb
Abstract
We report the detection of a complex of narrow X-ray absorption features from the low-mass X-ray binary GX13+1 during 3 XMM-Newton observations in 2000 March and April. The features are consistent with being due to resonant scattering of the Kalpha and Kbeta lines of He- and H-like iron (Fe xxv and Fe xxvi) and H-like calcium (Ca xx) Kalpha. Only the Fe xxvi Kalpha line has been previously observed from GX13+1. Due to the closeness in energy the Fe xxv and Fe xxvi Kbeta features may also be ascribed to Nixxvii and Nixxviii Kalpha, respectively. We also find evidence for the presence of a deep (tau~0.2) Fe xxv absorption edge at 8.83 keV. The equivalent widths of the lines do not show any obvious variation on a timescale of a few days suggesting that the absorbing material is a stable feature of the system and present during a range of orbital phases.
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