[1] Chinese Acad Sci, CAS Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
[2] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
[3] Shandong Univ, Sch Math & Stat, Weihai 264209, Shandong, Peoples R China
[4] Shandong Univ, Sch Mech Elect & Informat Engn, Weihai 264209, Shandong, Peoples R China