[1] China West Normal Univ, Sch Phys & Astron, 1 ShiDa Rd, Nanchong 637002, Peoples R China
[2] Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China
[3] Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China
[4] Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Peoples R China
[5] 1 Middle Sch Yuechi Cty Sichuan Prov, Inst Phys, 518 YinCheng Rd, Yuechi 638399, Peoples R China
[6] Univ Chinese Acad Sci, Beijing 100049, Peoples R China