[1] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan
[2] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
[3] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[4] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
[5] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan
[6] CSIC, ICE, Can Magrans S-N, E-08193 Cerdanyola Del Valles, Catalonia, Spain
[7] IEEC, E-08034 Barcelona, Catalonia, Spain
[8] Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China
[9] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
[10] ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany