M5 RR Lyrae times of maxima

Secular period variations, {beta}=dP/dt, in 76 RR Lyrae stars in the globular cluster M5 are analysed using our most recent CCD V photometry and the historical photometric data...本研究利用最新的电荷耦合器件(CCD) V波段测光数据与历史测光数据，对球状星团M5内76颗天琴座RR型变星(RR Lyrae stars)的长期周期变化（其中参数β=dP/dt，即周期变化率）进行了分析……