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Issue A&A Volume 420, Number 3, June IV 2004 Page(s) 1079 - 1085 Section Stellar atmospheres DOI 10.1051/0004-6361:20035644

A&A 420, 1079-1085 (2004)
DOI: 10.1051/0004-6361:20035644

Detection and high-resolution spectroscopy of a huge flare on the old M 9 dwarf DENIS 104814.7-395606.1

B. Fuhrmeister and J. H. M. M. Schmitt

Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany

(Received 7 November 2003 / Accepted 14 March 2004)

Abstract
We report a flare on the M 9 dwarf DENIS 104814.7-395606.1, whose mass places it directly at the hydrogen burning limit. The event was observed in a spectral sequence during 1.3 h. Line shifts to bluer wavelengths were detected in , , and in the Na I D lines, indicating mass motions. In addition we detect a flux enhancement on the blue side of the two Balmer lines in the last spectrum of our series. We interpret this as rising gas cloud with a projected velocity of about 100  which may lead to mass ejection. The higher Balmer lines to H₈ are not seen due to our instrumental setup, but in the last spectrum there is strong evidence for H₉ being in emission.

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

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

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