Three Open Clusters Containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55
Astronomy and Astrophysics（2020）
关键词
open clusters and associations: individual: NGC 6649,open clusters and associations: individual: NGC 6664,open clusters and associations: individual: Berkeley 55,Hertzsprung-Russell and C-M diagrams,stars: abundances,stars: variables: Cepheids
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