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A&A 365, L324-L328 (2001)
DOI: 10.1051/0004-6361:20000047
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
A. C. Brinkman1, E. Behar2, M. Güdel3, M. Audard3, A. J. F. den Boggende1, G. Branduardi-Raymont4, J. Cottam2, C. Erd5, J. W. den Herder1, F. Jansen5, J. S. Kaastra1, S. M. Kahn2, R. Mewe1, F. B. S. Paerels2, J. R. Peterson2, A. P. Rasmussen2, I. Sakelliou4 and C. de Vries1.1 Space Research Organization of The Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA
3 Paul Scherrer Institute, Würenlingen and Villigen, 5235, Switzerland
4 Mullard Space Science Laboratory, University College London, Dorking RH5 6NS, UK
5 Astrophysics Division, Space Science Department of ESA, ESTEC, 2200 AG Noordwijk, The Netherlands
(Received 2 October 2000 / Accepted 24 October 2000)
Abstract
The RS CVn binary system HR 1099 was extensively observed by the
XMM-Newton observatory in February 2000 as its first-light target.
A total of 570 ks of exposure time was accumulated with the Reflection
Grating Spectrometers (RGS). The integrated X-ray spectrum between
5-35 Åis of unprecedented quality and 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 elemental
composition of the average corona of this system, and find that the
elemental abundances strongly depend on the first ionisation potential
(FIP) of the elements. But different from the solar coronal case, we find
an inverse FIP effect, i.e., the abundances (relative to
oxygen) increase with increasing FIP. Possible scenarios, e.g.,
selective enrichment due to Ne-rich flare-like events, are discussed.
Key words: atomic processes -line: formation -nuclear reactions, nucleosynthesis, abundances -stars: coronae -stars: individual (HR 1099) - X-rays: stars
Offprint request: B. Brinkman SIMBAD Objects
© ESO 2001