Astronomical;
Observatories/Yunnan;
Observatory,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650011,;
China;
Laboratory;
for;
the;
Structure;
and;
Evolution;
of;
Celestial;
Objects,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650011,;
China;
University;
of;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100049,;
China;