1. Purple Mountain Observatory, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing 210023, China
2. School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, China
3. Chinese Academy of Sciences South America Centre for Astronomy, China-Chile Joint Centre for Astronomy, Camino del Observatorio 1515, Las Condes, Chile
4. Centro de Astrofísica y Tecnologías Afines (CATA), Camino del Observatorio 1515, Las Condes, Santiago, Chile
5. European South Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile
6. Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
7. CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China