Affiliation: | National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, P.R. China;United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, P.R. China;Graduate School of the CAS, Beijing, P.R. China;Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina;Mt Suhora Observatory, Cracow Pedagogical University ul. Podchorazych 2, 30-084 Krakow, Poland |