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

被引：50

作者：

Reid, IN

Kirkpatrick, JD

Gizis, JE

Liebert, J

机构：

[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[2] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA

[3] Univ Massachusetts, Dept Phys & Astron, Amherst, MA 01003 USA

[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 527卷 / 02期

关键词：

stars : chromospheres; stars : late-type; stars : low-mass; brown dwarfs;

D O I：

10.1086/312409

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of an H alpha flare on the low-luminosity M9.5 dwarf 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 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.

引用

页码：L105 / L107

页数：3

共 28 条

[1]

[Anonymous], MNRAS

[2] A SURPRISE AT THE BOTTOM OF THE MAIN-SEQUENCE - RAPID ROTATION AND NO H-ALPHA EMISSION [J].