Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment;
Institute of Space Sciences;
Shandong University;
Weihai 264209;
China;
Xinjiang Astronomical Observatory;
Urumqi 830011;
China;
Qilu Institute of Technology;
Jinan 250200;
China;
binaries:close; binaries:eclipsing; stars:evolution; stars:individual(V811 Cep);