UBVRI photometry in cluster Tr 18
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UBVRI photoelectric photometry was obtained in the field of the open cluster Tr 18. From the analysis of the data we confirm that several distant OB stars were wrongly assumed...
针对疏散星团Tr 18的观测天区，我们获取了UBVRI光电测光（UBVRI Photoelectric Photometry）数据。通过对该批数据的分析，我们证实此前有多颗遥远的OB恒星（OB stars）被错误认定为……
