Fe XIII coronal line emission in cool M dwarfs

Abstract

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

13 pages, 10 figures

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• Multi-wavelength observations of Proxima Centauri
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• PHOENIX model chromospheres of mid- to late-type M dwarfs
• Spectral energy distribution for GJ406
• A coronal explosion on the flare star CN Leonis
• Multiwavelength observations of a giant flare on CN Leonis III. Temporal evolution of coronal properties
• Evidence of Multiple Slow Acoustic Oscillations in the Stellar Flaring Loops of Proxima Centauri