Abstract

This paper presents the results of the analysis of the integrated-light spectra of eight Galactic globular clusters with a relatively low luminosity and stellar density: Palomar 1, Palomar 2, Palomar 10, Palomar 13, Palomar 14, NGC 6426, NGC 6535, and NGC 6749. The absorption spectral indices in the Lick system were measured in their spectra, as well as in the spectra of bright clusters: NGC 7006, NGC 6229, NGC 6779, NGC 6205, NGC 6341, and NGC 2419. The age, metallicity, and approximate abundance of the \(\alpha \)-process elements were determined for eight objects under study. The material of the study was the archival observational data of the 1.93-m telescope of the Haute-Provence Observatory. For seven out of eight objects, galactic analogs with close values of the Lick indices within the limits of their determination errors were found. The coincidence of the Lick indices implies the similarity of age and chemical composition. The available literature data confirm our conclusions regarding the similarity of the properties of the clusters’ stellar populations. According to the literature data on the spatial position and motion of objects, the objects of study turned out to belong, as a rule, to the same subsystems of the Galaxy as their analogs. No globular clusters with a complete set of Lick indices similar to those of Palomar 1 were found, which supports the literature conclusions about its possible extragalactic origin. Our photometry of stars in the VLT images and the Gaia DR3 data allowed us to estimate the metallicity, age, color excess, and distance for Palomar 10. The Gaia DR3 data for NGC 6426 were analyzed.

中文翻译：

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八个中央表面亮度较低的全球星系团星族的特性

摘要

本文介绍了八个具有相对较低光度和恒星密度的星系球状星团的积分光谱分析结果：Palomar 1、Palomar 2、Palomar 10、Palomar 13、Palomar 14、NGC 6426、NGC 6535 和NGC 6749。在 Lick 系统中的吸收光谱指数在它们的光谱以及亮星团的光谱中测量：NGC 7006、NGC 6229、NGC 6779、NGC 6205、NGC 6341 和 NGC 2419。年龄、金属丰度，以及\(\alpha \) 的近似丰度- 为研究中的八个对象确定了过程元素。该研究的材料是上普罗旺斯天文台 1.93 米望远镜的档案观测数据。对于八分之七的天体，发现了具有接近的 Lick 指数值在其确定误差范围内的星系类似物。Lick 指数的巧合意味着年龄和化学成分的相似性。现有的文献数据证实了我们关于星团恒星族群属性相似性的结论。根据关于物体空间位置和运动的文献数据，研究对象通常与它们的类似物属于相同的银河系子系统。没有发现具有与 Palomar 1 相似的全套 Lick 指数的球状星团，这支持了关于其可能的河外起源的文献结论。我们对 VLT 图像中恒星的光度测量和 Gaia DR3 数据使我们能够估计 Palomar 10 的金属丰度、年龄、颜色过量和距离。分析了 NGC 6426 的 Gaia DR3 数据。