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Summary: A&A 407, 347358 (2003)
DOI: 10.1051/0004-6361:20030880
c ESO 2003
Astronomy
&
Astrophysics
Are stellar coronae optically thin in X-rays?
A systematic investigation of opacity effects
J.-U. Ness1, J. H. M. M. Schmitt1, M. Audard2, M. G¨udel3, and R. Mewe4
1
Hamburger Sternwarte, Universit¨at Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
2
Columbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027, USA
3
Paul Scherrer Institut, W¨urenlingen & Villigen, 5232 Villigen PSI, Switzerland
4
National Institute for Space Research (SRON), Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Received 23 January 2003 / Accepted 2 June 2003
Abstract. The relevance of resonant scattering in the solar corona has always been discussed controversially. Ratios of emission
lines from identical ions but different oscillator strengths have been used in order to estimate damping of resonance lines due
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