Q. F. Pi

Chromospheric variabilities of M active stars based on Guoshoujing Telescope

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$_α$, H$_β$, and H$_γ$ lines on short or long timescales.