Stellar Coronae with \textit{XMM-Newton} RGS. I. Coronal Structure

Details Stellar Coronae with \textit{XMM-Newton} RGS. I. Coronal Structure Stellar Coronae with \textit{XMM-Newton} RGS. I. Coronal Structure

2000-11-30

arxiv.org/abs/astro-ph/0011573v1

Astronomy and Astrophysics

Astrophysics

To appear in Proc. of "X-ray astronomy 2000",(Palermo Sep. 2000), Eds. R. Giacconi, L. Stella, S. Serio, ASP Conf. Series, in

Scientific paper

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 $10^{10}$ cm$^{-3}$ for cooler plasma, although there are indications for very high densities in the hotter plasma components.

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