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;
Center for Astronomical Mega-Science;
Chinese Academy of Sciences;
Beijing 100101;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
techniques; spectroscopic-techniques; photometric-stars; fundamental parameters-stars; variables; RR Lyrae;