A sample of the LAMOST spectra of the early type M0-M3 dwarfs is compared with the Kepler observations. It is found that M dwarfs with strong chromospheric emission in Hα have large flare activity in general. The rotational periods derived from the Kepler measurements have close correlations with the sizes of the flares, the power-law distribution index and the equivalent widths of the Hα emission. A clear trend exists for higher magnetic activities being detected in faster rotating M dwarfs (rotation periods < 20 day).
@article{arxiv.1610.04541,
title = {LAMOST Observations of Flaring M Dwarfs in the Kepler Field},
author = {H. -Y. Chang and Y. -H. Song and A. -L. Luo and L. -C. Huang and W. -H. Ip and J. -N. Fu and Y. Zhang and Y. -H. Hou and Z. -H Cao and Y. -F Wang},
journal= {arXiv preprint arXiv:1610.04541},
year = {2017}
}