论文标题
银河球状簇的哈勃太空望远镜紫外线遗产调查。 xxii。五个球状簇中多个人群的相对年龄
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXII. Relative ages of multiple populations in five Globular Clusters
论文作者
论文摘要
目标。我们提出了一种新技术，以估计由五个球状簇托管的多个恒星种群的相对年龄：NGC 104（47 TUC），NGC 6121（M4），NGC 6352，NGC 6362和NGC 6723。方法。我们使用了数据库“ HST UV球形群集调查（HUGS）”的目录来创建颜色质量和球状簇的两色图。我们确定了每个球状簇中的多个人群，并将它们分为两个主要的恒星种群：POPA或第一代（1G）和POPB，由所有连续的恒星组成。新技术使我们能够获得POPA和POPB之间相对年龄的准确估计。结果。 NGC 104和NGC 6121的多个种群在220 Myr和214 Myr之内是共轴，而NGC 6352，NGC 6362和NGC 6723的多种种群分别在336 Myr，474 Myr和634 Myr中是共轴。这些结果是将所有不确定性来源结合在一起的。
Aims. We present a new technique to estimate the relative ages of multiple stellar populations hosted by five globular clusters: NGC 104 (47 Tuc), NGC 6121 (M4), NGC 6352, NGC 6362 and NGC 6723. Methods. We used the catalogs of the database "HST UV Globular cluster Survey (HUGS)" to create color-magnitude and two-color diagrams of the Globular Clusters. We identified the multiple populations within each globular cluster, and we divided them into two main stellar populations: POPa or first generation (1G) and POPb, composed of all the successive generations of stars. The new technique allows us to obtain an accurate estimate of the relative ages between POPa and POPb. Results. The multiple populations of NGC 104 and NGC 6121 are coeval within 220 Myr and 214 Myr, while those of NGC 6352, NGC 6362 and NGC 6723 are coeval within 336 Myr, 474 Myr and 634 Myr, respectively. These results were obtained combining all the sources of uncertainties.
