| Issue |
A&A
Volume 420, Number 3, June IV 2004
|
|
|---|---|---|
| Page(s) | 1079 - 1085 | |
| Section | Stellar atmospheres | |
| DOI | https://doi.org/10.1051/0004-6361:20035644 | |
| Published online | 04 June 2004 | |
Detection and high-resolution spectroscopy of a huge flare on the old M 9 dwarf DENIS 104814.7-395606.1*
Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Corresponding author: B. Fuhrmeister, bfuhrmeister@hs.uni-hamburg.de
Received:
7
November
2003
Accepted:
14
March
2004
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
are not seen due to our instrumental setup, but in the last spectrum
there is strong evidence for 
being in emission.
Key words: stars: activity / stars: flare / stars: late-type
© ESO, 2004
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