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tokens: ACKNOWLEDGEMENTS Our research was supported by the Joint Research Fund in Astronomy (No.11963002; U1631236 and U1431114) under a cooperative agreement between NSFC and CAS. We also want to thank Dr Frank Levinson for his generous financial support that enabled Butler University to join the SARA telescope consortium and upgrade its Holcomb Observatory telescope. This work was also supported by the Natural Science Foundation of Guizhou Province Office of Education (Grant No. 2014298). We also thank Professor Prabhakar Misra for revising the language of our paper. We acknowledge the support of the staff of the Xinglong 60-cm telescope and Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS–CAS.