Catalogue of OB Associations
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OB associations are unbound groups of young stars made prominent by their bright OB members, and have long been thought to be the expanded remnants of dense star clusters. They...
OB星协（OB associations）是一类以明亮的OB型成员恒星为显著标志的未束缚年轻恒星群，长期以来被学界认为是致密星团膨胀后的残余结构。它们……
