1. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, P. R. China
2. University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, P. R. China
3. Department of Astronomy, Beijing Normal University, Beijing 100875, P. R. China
4. National Astronomical Observatories of China, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, P. R. China
5. Physics and space science college, China West Normal University, Nanchong 637002, P. R. China
6. Observatorio Astrónomico Nacional, Institute de Astronomía, Universidad Nacional Autónoma de México, AP.877, Ensenada 2860, México
7. National Astronomical Observatories of China, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042, P. R. China
8. School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China