论文标题
RR Lyrae星星在球形群集palomar 2中
RR Lyrae stars in the globular cluster Palomar 2
论文作者
论文摘要
使用11年以上的CCD VI成像时间序列来探索Palomar 2领域的恒星的光曲线。我们发现了20个RRAB和1个RRC变量。 GAIA-DR3数据的修订使我们能够识别出10个变量，并确认其中6个和1个RGB的RRAB性质。讨论了群集成员资格，并且18个变量很可能是群集成员。群集成员星的11个最佳质量光曲线的傅立叶曲线分解导致群集距离的独立估计27.2 +-1.8 kpc和[Fe/H] ZW = -1.39 +-0.55。我们确认群集为OO I类型。
A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-DR3 data enabled us to identify 10 more variables and confirm the RRab nature of 6 of them and one RGB. The cluster membership is discussed and 18 variables are most likely cluster members. The Fourier light curve decomposition for the 11 best quality light curves of cluster member stars leads to independent estimates of the cluster distance 27.2 +- 1.8 kpc and [Fe/H]ZW=-1.39 +- 0.55. We confirm the cluster as of the Oo I type.
