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Summary: A Systematic Spectroscopic X-Ray Study of Stellar
Coronae with XMM-Newton: Early Results
M. Gudel 1 , M. Audard 1 , K. W. Smith 1;2 , A. Sres 1;2 , C. Escoda 1 , R.
Wehrli 1;3 , E. F. Guinan 4 , I. Ribas 4 , A. J. Beasley 5 , R. Mewe 6 , A. J.
Raassen 6 , E. Behar 7 , H. Magee 8
Abstract. We have been conducting a comprehensive survey of stellar
coronae with the XMM-Newton Re
ection Grating Spectrometers during
the commissioning, calibration, veri cation, and guaranteed time phases
of the mission, accompanied by simultaneous observations with the EPIC
cameras and, for several targets, with the radio VLA and/or the VLBA.
The principal aim of this project is threefold: i) To understand stellar
coronal structure and composition by studying systematics in the coronae
of stars with widely di erent levels of magnetic activity; ii) to investigate
heating and particle acceleration physics during
ares, their role in the
overall coronal energy budget, and their possible role in the quiescent
stellar emission; iii) to probe stellar coronal evolution by studying solar
analogs of di erent ages. We report early results from this project.
1. Introduction
With the advent of XMM-Newton and Chandra, it has become possible for the
rst time to routinely investigate high-resolution stellar X-ray spectra. The
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