X-ray emission from the ultracool dwarf LHS 2065

Details X-ray emission from the ultracool dwarf LHS 2065 X-ray emission from the ultracool dwarf LHS 2065

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...382l...9s&link_type=abstract

Astronomy and Astrophysics, v.382, p.L9-L12 (2002)

Astronomy and Astrophysics

Astrophysics

30

Stars: Activity, Stars: Coronae, Stars: Late Type, Stars: Flare, X-Rays: Stars

Scientific paper

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 4 x 1027 erg/s and a total soft energy release of 2 x 1031 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 2.3 x 1026 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.

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