1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China
2. Key Laboratory for the Structure and Evolution Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China
3. Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
4. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
5. Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, NL-9700 AV Groningen, The Netherlands
6. Department of Physics, Xiangtan University, Xiangtan, Hunan 411105, People’s Republic of China
7. Key Laboratory of Stars and Interstellar Medium, Xiangtan University, Xiangtan, Hunan 411105, People’s Republic of China