Flares of M-stars in Upper Scorpius region and flares and CMEs of the active M-star AD Leo

Abstract

Using the Kepler K2 data, we studied the flare-activity of young K-and M-stars in the Upper Sco region and found that they have 10000 to 80000 times as many super-flares with E> 5E34 erg than solar like stars. The power-law index for flares is $N/dE~E^-1.2 for K stars, N/dE~E^-1.4 for early M-star and dN/dE~E^-1.3 for late M stars, which is about the same as that of the Sun. We also observed the active M-star AD Leo spectroscopy for 222 hours, detected 22 flares but no coronal mass ejections.

2 pages, 1 figure, proceedings of the conference: "Stars and their variability observed from space" held in Vienna in August 2019, C. Neiner, W. Weiss, D. Baade, E. Griffin, C. Lovekin, A. Moffat (eds.)