| Issue |
A&A
Volume 417, Number 2, April II 2004
|
|
|---|---|---|
| Page(s) | 701 - 713 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20034464 | |
| Published online | 19 March 2004 | |
Fe XIII coronal line emission in cool M dwarfs*
Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Corresponding author: B. Fuhrmeister, bfuhrmeister@hs.uni-hamburg.de
Received:
7
October
2003
Accepted:
17
December
2003
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
© ESO, 2004
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