Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-Dependent Spectral Behavior

Hai-Cheng Feng, Sen. Yang, Zi-Xu. Yang +17

In this paper, we report the new results of spectroscopic observations of $\gamma$-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang O…