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The RS CVn binary system HR 1099 was extensively observed by the XMM-Newtonobservatory in February 2000 as its first-light target. A total of 570 ks ofexposure time was accumulated with the Reflection Grating Spectrometers (RGS).The integrated X-ray spectrum between 5-35 Angstrom is of unprecedented qualityand shows numerous features attributed to transitions of the elements C, N, O,Ne, Mg, Si, S, Fe, and Ni. We perform an in-depth study of the elementalcomposition of the average corona of this system, and find that the elementalabundances strongly depend on the first ionisation potential (FIP) of theelements. But different from the solar coronal case, we find an inverse FIPeffect, i.e., the abundances (relative to oxygen) increase with increasing FIP.Possible scenarios, e.g., selective enrichment due to Ne-rich flare-likeevents, are discussed.Comment: 5 pages, 4 figures. Accepted by A&A Letters, XMM issu

astronomy and astrophysics

First light measurements with the XMM-Newton reflection grating spectrometers: Evidence for an inverse first ionisation potential effect and anomalous Ne abundance in the Coronae of HR 1099