1. National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100101, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. NAOC-UKZN Computational Astrophysics Centre (NUCAC), University of KwaZulu-Natal, Durban 4000, South Africa
4. Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02318, USA
5. Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile
6. Department of Physics, Taiyuan Normal University, Jinzhong 030619, China
7. Chongqing University, No.174 Shazhengjie, Shapingba, Chongqing 400044, China