Affiliation: | Xiao-Yan Gao1,2,3,Jian-Cheng Wang1,2 and Ming Zhou1,3 1 National Astronomical Observatories /Yunnan Observatories,Chinese Academy of Sciences,Kunming 650011,China 2 Key Laboratory for the Structure and Evolution of Celestial Objects,China 3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China |