Activity and rotation in Praesepe and the Hyades

Open clusters are collections of stars with a single, well-determined age, and can be used to investigate the connections between angular-momentum evolution and magnetic...疏散星团（Open clusters）是由单一年龄且年龄可被精确测定的恒星组成的恒星集群，可用于研究角动量演化与磁相关特性之间的关联……