Chromospheric variabilities of M active stars based on Guoshoujing Telescope

TL;DR

This study analyzes chromospheric variability in M active stars using multiple observations from the Guoshoujing Telescope, revealing significant variability in key spectral lines over various timescales.

Contribution

It provides the first large-scale analysis of chromospheric variability in M active stars based on LAMOST data, highlighting the dynamic nature of these stars.

Findings

Many M active stars exhibit chromospheric variability.

Variability observed in Ca H, Hα, Hβ, and Hγ lines.

Variations occur over both short and long timescales.

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.