Department of Astronomy;
Nanjing University;
Nanjing 210093;
China;
Kwasan and Hida Observatories;
Kyoto University;
Yamashina;
Kyoto 607-8471;
Japan;
Unit of Synergetic Studies for Space;
Kyoto University;
Yamashina;
Kyoto 607-8471;
Japan;
Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University);
Ministry of Education;
Nanjing 210093;
China;