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A&A 382, L9-L12 (2002)
DOI: 10.1051/0004-6361:20011295
Letter
X-ray emission from the ultracool dwarf LHS 2065
J. H. M. M. Schmitt and C. LiefkeHamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
e-mail: cliefke@hs.uni-hamburg.de
(Received 30 July 2001 / Accepted 15 September 2001 )
Abstract
We report the results of a 68 ks long X-ray
observation of the M9V ultracool dwarf
star LHS 2065 with
the ROSAT high resolution imager (HRI). During the observations a major
X-ray flare occurred with a peak X-ray luminosity of
erg/s and a total soft energy release
of
erg. In addition, another flare with smaller
peak X-ray luminosity and energy release occurred. The X-ray observations
were carried out half a year apart. In the first half of the observations
no significant X-ray emission from LHS 2065 could be detected, while in the
second half in addition to flares also quiescent X-ray emission at a level
of
erg/s was seen. LHS 2065 belongs to the coolest
hydrogen burning stars known. The ROSAT observations show that coronal
emission may be quite common even among such very late-type stars.
Key words: stars: activity -- stars: coronae -- stars: late type -- stars: flare -- X-rays: stars
Offprint request: J. H. M. M. Schmitt, jschmitt@hs.uni-hamburg.de
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