Color-period diagram for M48 (NGC2548)

Rotation periods are increasingly being used to derive ages for cool single field stars. Such ages are based on an empirical understanding of how cool stars spin down, acquired...自转周期正日益被用于低温孤立场星的定年工作。此类年龄估算基于学界对低温恒星自转减速规律的经验性认知，该认知源自……