Photographic observations of suspected unusual variables in M4∗

Yao, Bao-An; Ji-sheng, Yin; Guo, Zhifang

doi:10.1016/0275-1062(81)90015-1

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2019

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“…Given the caveats of our variable-search method and the relatively low noise levels our light curves were able to reach, we decided to take a closer look at these stars, particularly their raw light curves. V54 was marked "CST" from the time of its initial listing in the Clement et al (2001) catalog because the first report of its variability (Yao et al 1981a; see also Yao et al 1981b for an English translation) reported such a small amplitude for the star and it was observed over only a ∼2-hour time window total. V54 is a giant star and a proper motion member of the cluster.…”

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confidence: 99%