The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVIII. Proper-motion kinematics of multiple stellar populations in the core regions of NGC 6352
M. Libralato, A. Bellini, G. Piotto, D. Nardiello, R. P. van der Marel, J. Anderson, L. R. Bedin, E. Vesperini
备注：
14 pages, 16 figures, 2 tables, accepted for publication in ApJ
We present the analysis of the radial distributions and kinematic properties of the multiple stellar populations (mPOPs) hosted in the globular cluster (GC) NGC 6352 as part of the Hubble Space Telescope (HST) "UV Legacy Survey of Galactic Globular Clusters" program. NGC 6352 is one of the few GCs for which the mPOP tagging in appropriate color-magnitude diagrams is clear in all evolutionary sequences. We computed high-precision stellar proper motions for the stars from the cluster's core out to 75 arcsec ($\sim$1.5 core radii, or $\sim$0.6 half-light radii). We find that, in the region explored, first- and second-generation stars share the same radial distribution and kinematic properties. Velocity dispersions, anisotropy radial profiles, differential rotation, and level of energy equipartition, all suggest that NGC 6352 is probably in an advanced evolutionary stage, and any possible difference in the structural and kinematic properties of its mPOPs have been erased by dynamical processes in the core of the cluster. We also provide an estimate of the mass of blue stragglers and of main-sequence binaries through kinematics alone. In general, in order to build a complete dynamical picture of this and other GCs, it will be essential to extend the analyses presented in this paper to the GCs' outer regions where some memories of the initial differences in the mPOP properties, and those imprinted by dynamical processes, might still be present.
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion catalogs and internal kinematics
基于$\textit{Hubble Space Telescope}$（$\textit{HST}$）GO-13297计划“HST银河系球状星团遗产巡天：在它们的种群和形成上散发紫外光”收集的数据的一些研究调查了银河系球状星团的大样本的光度特性，并彻底改变了我们对其恒星星族的理解。在本文中，我们扩展了以往的研究，集中我们的注意力在星团的内部运动学。我们计算了56个球状星团和一个疏散星团中恒星的自行，结合GO-13297图像与档案$\textit{HST}$数据。与本文一起发布的天体光度计星表代表了迄今为止星团核心中恒星自行的最完整和最均匀的集合，并将当前（和未来）$\textit{Gaia}$ $\textit{Gaia}$数据发布提供的信息扩展到更暗的恒星和拥挤的中心区域。我们还普查的一般运动学性质的星团通过计算其明亮的成员的速度色散和各向异性的径向轮廓。我们研究了浓度和弛豫时间的依赖关系，并推导出动力学距离。最后，我们对球状星团NGC 5904进行了深入的运动学分析。
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of single and multiple stellar populations in seven bulge globular clusters
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XIV. Multiple stellar populations within M 15 and their radial distribution
在哈勃太空望远镜银河球状星团紫外巡天的背景下，我们推导出高精度，多波段测光，以调查在大质量和金属贫乏的GC M 15中的多个恒星星族。通过创建红巨星分支（RGB）恒星的集群的“染色体地图”，这是一个伪双色图与适当的组合的F275 W，F336 W，F438 W，和F814 W的星等，我们揭示了颜色传播周围的三个已知的恒星星族。这些扩散不能仅由光度误差产生，并且可能隐藏（两个）额外种群的存在。这一发现增加了M15中多种群现象的复杂性。我们的分析表明，M15表现出一个微弱的亚巨星分支（SGB），这也是在彩色星等图（CMD）中检测到的光学星等。这颗星的数量约占整个星的5%，并在m_F336 W-m_F814 WCMD中演化为红色RGB，表明M 15属于II型GC。我们测量了每个人口中恒星的相对数量在不同的径向距离从集群中心，显示所有这些人口共享相同的径向分布的统计不确定性。这些新的发现进行了讨论的背景下，形成和演变的多个种群的情况。
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IV. Helium content and relative age of multiple stellar populations within NGC 6352
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. VII. Implications from the Nearly Universal Nature of Horizontal Branch Discontinuities
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XIX. A Chemical Tagging of the Multiple Stellar Populations Over the Chromosome Maps
Exploring the formation mechanisms of tidal structures in globular clusters of extragalactic origin
Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学前沿天文与天体物理研究所）；School of Physics and Astronomy, Beijing Normal University（北京师范大学物理与天文学院）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）
Zwicky Transient Facility and Globular Clusters: the gr-Band Period-Luminosity Relations for Mira Variables at Maximum Light and Their Applications to Local Galaxies
The independence of the mid-infrared RR Lyrae Period-Luminosity relation from metallicity from a study of three globular clusters in the Large Magellanic Cloud
Department of Physics, University of Bath（巴斯大学物理系）
