Abstract
We report the detection of a complex of narrow X{ray absorption features from the low-mass X{ray binary GX 13+1 during 3 XMM-Newton observations in 2000 March and April. The features are consistent with being due to resonant scattering of the K and K lines of He- and H-like iron (Fe xxv and Fe xxvi )a nd H-like calcium (Ca xx )K. Only the Fe xxvi K line has been previously observed from GX 13+1. Due to the closeness in energy the Fe xxv and Fe xxvi K features may also be ascribed to Ni xxvii and Ni xxviii K, respectively. We also nd evidence for the presence of a deep ( 0:2) Fe xxv absorption edge at 8.83 keV. The ts also require the presence of a broad emission feature whose energy and width are poorly determined, partly due to the presence of the deep Fe K features which severely cut into the feature and partly due to t dierences when using dierent XMM-Newton instruments. 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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