Yunnan Observatories;
Chinese Academy of Sciences;
Kunming 650216;
China;
Key Laboratory of the Structure and Evolution of Celestial Objects;
Chinese Academy of Sciences;
Kunming 650216;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Department of Theoretical Physics and Astrophysics;
Masaryk University;
Kotlarska 2;
CZ-611 37 Brno;
Czech Republic;