Summary: HEAD 2000, November 2000
Session 45. Stellar Coronae/Cataclysmic Variables
Oral, Friday, November 10, 2000, 10:1011:30am, Pago Pago Ballroom
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[45.03] Stellar Coronal Spectroscopy with the XMMNewton
M. Guedel, M. Audard (Paul Scherrer Institut PSI, Switzerland), E. Behar, J. Cottam, S.M. Kahn, F.B.S.
Paerels, J.M. Peterson, A.P. Rasmussen (Columbia University, USA), G. BranduardiRaymont, I.
Sakelliou (MSSL, UK), A.J. den Boggende, A.C. Brinkman, J.W. den Herder, J.S. Kaastra, R. Mewe, T.
Tamura, C. de Vries (SRONUtrecht, The Netherlands), C. Erd (ESTeC/ESA, The Netherlands), XMM
High resolution Xray spectroscopy opens new windows to the study of the structuring and energetics of
stellar coronae. XMMNewton has obtained excellent spectra of several stellar coronal sources (e.g.,
HR1099, Capella, YY Gem, and AB Dor) with its two Reflection Grating Spectrometers (RGS). These
sources represent coronae of various activity levels, comprising a wide range of plasma temperatures.
Several flares were observed in the course of the observations for which timeresolved RGS
spectroscopy will be presented. The RGS spectra offer important diagnostics to probe properties of the
coronal plasma. The large number of detected lines from various elements offer the possibility to
determine emission measure distributions between approximately 120 MK. Helike triplets further
provide information on electron densities at various temperatures. Coronal elemental abundances are