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Summary: A&A 427, 667683 (2004)
DOI: 10.1051/0004-6361:20040504
c ESO 2004
Astronomy
&
Astrophysics
On the sizes of stellar X-ray coronae
J.-U. Ness1, M. Güdel2, J. H. M. M. Schmitt1, M. Audard3, and A. Telleschi2
1
Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
e-mail: jness@hs.uni-hamburg.de
2
Paul Scherrer Institut, Würenlingen & Villingen, 5232 Villingen PSI, Switzerland
3
Columbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027, USA
Received 24 March 2004 / Accepted 5 July 2004
Abstract. Spatial information from stellar X-ray coronae cannot be assessed directly, but scaling laws from the solar corona
make it possible to estimate sizes of stellar coronae from the physical parameters temperature and density. While coronal plasma
temperatures have long been available, we concentrate on the newly available density measurements from line fluxes of X-ray
lines measured for a large sample of stellar coronae with the Chandra and XMM-Newton gratings. We compiled a set of 64
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