1. Yunnan Observatories, Chinese Academy of Sciences (CAS) , P. O. Box 110, 650216 Kunming, China
2. University of Chinese Academy of Sciences , No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049, China
3. Center for Astronomical Mega-Science, Chinese Academy of Sciences , 20A Datun Road, Chaoyang District, Beijing, 100012, China
4. Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , P. O. Box 110, 650216 Kunming, China
5. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata , Paseo del Bosque s/n, 1900 La Plata, Buenos Aires, Argentina
6. Instituto de Astrofísica de La Plata (CCT La Plata − CONICET/UNLP) , 1900 La Plata, Argentina