Flares at the Cool End of the M Dwarfs: The Case of LHS 2065

Details Flares at the Cool End of the M Dwarfs: The Case of LHS 2065 Flares at the Cool End of the M Dwarfs: The Case of LHS 2065

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....121.2758m&link_type=abstract

The Astronomical Journal, Volume 121, Issue 5, pp. 2758-2760.

Astronomy and Astrophysics

Astronomy

27

Stars: Activity, Stars: Flare, Stars: Individual (Lhs 2065), Stars: Late-Type

Scientific paper

LHS 2065 is an M9 very low mass star at a distance of 8.5 pc. It was known to have Hα emission, but no other emission lines had been seen before. We observed it on 1998 December 12 and found a rich emission spectrum (He I, Na D, and Balmer series). Additional spectra were obtained after 1 hr, 2 hr, and 1 day. They showed progressively weaker emission lines. Using our data and a compilation of the literature, we find that, while strong flares in LHS 2065 are rare (their recurrence rate is <=0.03 hr-1), weak flares may be common (about 0.5 hr-1). Our observations add to the growing evidence that many, if not all, of the coolest M dwarfs have flare activity.

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