Identification of strong photometric activity in the components of LHS 1070

Details Identification of strong photometric activity in the components of LHS 1070 Identification of strong photometric activity in the components of LHS 1070

2010-10-06

arxiv.org/abs/1010.1277v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 5 figures, accepted for publication in A&A

Scientific paper

Activity in low-mass stars is an important ingredient in the evolution of such objects. Fundamental physical properties such as age, rotation, magnetic field are correlated with activity. Aims: We show that two components of the low-mass triple system LHS 1070 exhibit strong flaring activity. We identify the flaring components and obtained an improved astrometric solution for the LHS 1070 A/(B+C) system. Methods: Time-series CCD observations were used to monitor LHS 1070 in the B and I_C bands. H-band data were used to obtain accurate astrometry for the LHS 1070 A/(B+C) system. Results: We have found that two components of the triple system LHS 1070 exhibit photometric activity. We identified that components A and B are the flaring objects. We estimate the total energy, ~2.0 x 10^{33} ergs, and the magnetic field strength, ~5.5 kG, of the flare observed in LHS 1070 B. This event is the largest amplitude, \Delta B > 8.2 mag, ever observed in a flare star.

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