2000/11/30 by M. Guedel, M. Audard, Guedel, M. +35
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0011573
To appear in Proc. of "X-ray astronomy 2000",(Palermo Sep. 2000), Eds. R. Giacconi, L. Stella, S. Serio, ASP Conf. Series, in press
arxiv created 2000/11/30 · arxiv updated 2009/12/01
First results from high-resolution coronal spectroscopy with the \it XMM-Newton Reflection Grating Spectrometers (RGS) are reviewed. Five stellar systems (HR 1099, Capella, Procyon, YY Gem, AB Dor) have been observed. The emphasis of the present paper is on overall coronal structure. Elemental abundances in \it active stars are found to be `anomalous' in the sense that they tend to increase with increasing First Ionization Potential (FIP - i.e., signifying an inverse FIP effect). Coronal densities are measured at levels of a few times 1010 cm-3 for cooler plasma, although there are indications for very high densities in the hotter plasma components.