BRI 0021-0214: Another surprise at the bottom of the main sequence

Authors
Reid, IN Kirkpatrick, JD Gizis, JE Liebert, J
Citation
In. Reid et al., BRI 0021-0214: Another surprise at the bottom of the main sequence, ASTROPHYS J, 527(2), 1999, pp. L105-L107
Citations number
28
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004637X → ACNP
Volume
527
Issue
2
Year of publication
1999
Part
2
Pages
L105 - L107
Database
ISI
SICI code
0004-637X(199912)527:2<L105:B0ASAT>2.0.ZU;2-W
Abstract
We report the detection of an H alpha flare on the low-luminosity M9.5 dwar f BRI 0021-0214. This star has rapid rotation, v sin (i) similar to 40 km s (-1), but generally shows no significant chromospheric emission. Our detect ion 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 e arly- 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.