Chromospheric variabilities of M active stars based on Guoshoujing Telescope

Abstract

For the M active catalogue of Guoshoujing Telescope (LAMOST), 933 sources are presented in at least two exposures. We found that many M active stars show chromospheric variabilities in the Ca H, H${}_{\alpha }$, H${}_{\beta }$, and H${}_{\gamma }$ lines on short or long timescales.

1 page, 1 figure, To appear in Proceedings IAU Symposium No. 298, "Setting the scene for Gaia and LAMOST", eds. S. Feltzing, G. Zhao, N. A. Walton, and P. A. Whitelock