BRI 0021-0214: Another Surprise at the Bottom of the Main Sequence

Details BRI 0021-0214: Another Surprise at the Bottom of the Main Sequence BRI 0021-0214: Another Surprise at the Bottom of the Main Sequence

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...527l.105r&link_type=abstract

The Astrophysical Journal, Volume 527, Issue 2, pp. L105-L107.

Astronomy and Astrophysics

Astronomy

43

Stars: Chromospheres, Stars: Late-Type, Stars: Low-Mass, Brown Dwarfs

Scientific paper

We report the detection of an Hα flare on the low-luminosity M9.5 dwarf BRI 0021-0214. This star has rapid rotation, vsin(i)~40 km s-1, but generally shows no significant chromospheric emission. Our detection of the flare shows that a magnetic field is present, although the level of activity at maximum is 3 times lower than the mean quiescent level in early- and mid-type M dwarfs. Based on data available in the literature, we estimate that the star is in outburst for no more than 7% of the time.

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