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Issue A&A Volume 417, Number 2, April II 2004 Page(s) 701 - 713 Section Stellar structure and evolution DOI 10.1051/0004-6361:20034464

A&A 417, 701-713 (2004)
DOI: 10.1051/0004-6361:20034464

Fe XIII coronal line emission in cool M dwarfs

B. Fuhrmeister, J. H. M. M. Schmitt and R. Wichmann

Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
(Received 7 October 2003 / Accepted 17 December 2003)

Abstract
We report on a search for the Fe XIII forbidden coronal line at 3388.1 Å in a sample of 15 M-type dwarf stars covering the whole spectral class as well as different levels of activity. A clear detection was achieved for LHS 2076 during a major flare and for CN Leo, where the line had been discovered before. For some other stars the situation is not quite clear. For CN Leo we investigated the timing behaviour of the Fe XIII line and report a high level of variability on a timescale of hours which we ascribe to microflare heating.

Key words: stars: activity -- stars: coronae -- stars: late-type

Offprint request: B. Fuhrmeister, bfuhrmeister@hs.uni-hamburg.de

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