Fe XIII coronal line emission in cool M dwarfs

Details Fe XIII coronal line emission in cool M dwarfs Fe XIII coronal line emission in cool M dwarfs

2004-01-08

arxiv.org/abs/astro-ph/0401102v1

Astron.Astrophys. 417 (2004) 701-713

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures

Scientific paper

10.1051/0004-6361:20034464

We report on a search for the Fe xiii forbidden coronal line at 3388.1 \AA 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.

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