1. Yunnan Observatories, Chinese Academy of Sciences, 650216 Kunming, China
2. University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan, 100049 Beijing, China
3. National Astronomical Research Institute of Thailand, Ministry of Science and Technology, Bangkok, Thailand
4. Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216 Kunming, China
5. Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China
6. Facultad de Ciencias Astronómicas y Geofísicas – UNLP, 1900 La Plata, Buenos Aires, Argentina
7. Instituto de Astrofísica de La Plata – CONICET/UNLP, 1900 La Plata, Buenos Aires, Argentina
8. Department of Physics and Astronomy, University of North Carolina, CB #3255, Chapel Hill, NC 27599, USA