Observations of variable stars in M9
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Observations of RR Lyrae variables near the transition between fundamental and first-overtone mode in the Oosterhoff type II (Oo II) globular clusters M80, M9, and NGC 2298 have...
对奥斯特霍夫Ⅱ型（Oosterhoff type II，Oo II）球状星团M80、M9及NGC 2298内处于基模（fundamental mode）与第一泛音模式（first-overtone mode）过渡区间的天琴座RR型变星（RR Lyrae variables）的观测已
