论文标题
银河球状簇的综合光谱分析
Analysis of integrated-light spectra of Galactic globular clusters
论文作者
论文摘要
我们介绍了确定年龄，氦质量分数（y）的结果，就使用的恒星进化模型，金属性（[Fe/h]）以及元素C，O，O，Na，Mg，Ca，Ca，Ti，Ti，Ti，Cr和Mn的丰度，用于26个星系的球状簇。在这项工作中，我们采用了一种由我们开发的方法，该方法采用了球状簇和恒星大气模型的中分辨率集成光谱，并且在本文中通过自动计算所研究物体中恒星的微扰动速度来补充。基于26个对象获得的数据以及我们先前研究的结果，结果表明，除碳外，我们测量的化学元素的丰度与簇的综合光谱分析以及从高分辨率光谱的分析中估计的文献估计是一致的。我们对[C/Fe]的估计与从簇的综合光谱获得的文献值一致。我们解释了球状簇的派生[C/Fe]与簇中最亮的恒星的文献[C/Fe]值之间的系统差异，以作为恒星演化过程中恒星大气中化学成分的变化。簇的估计绝对年龄和平均y与来自对象的色幅度图的分析的文献数据达成了合理的一致性。
We present the results of determination of the age, helium mass fraction (Y) in terms of the used stellar evolutionary models, metallicity ([Fe/H]), and abundances of the elements C, O, Na, Mg, Ca, Ti, Cr and Mn for 26 globular clusters of the Galaxy. In this work, we apply a method developed by us that employs medium-resolution integrated-light spectra of globular clusters and models of stellar atmospheres and it is supplemented in this paper by the automatic calculation of microturbulence velocities of stars in the studied objects. Based on the data obtained for 26 objects, as well as on the results of our previous studies, it is shown that the abundances of chemical elements, that we measured, with the exception of carbon, are consistent with the literature estimates from the analysis of integrated-light spectra of clusters and from high-resolution spectroscopic observations of their brightest stars. Our estimates of [C/Fe] are consistent with the literature values obtained from the integrated-light spectra of clusters. We interpret the systematic difference between the derived [C/Fe] for globular clusters and the literature [C/Fe] values for the brightest stars of the clusters as a change of the chemical composition in the atmospheres of stars during their evolution. The estimated absolute ages and average Y for the clusters are in a reasonable agreement with the literature data from the analysis of color magnitude diagrams of the objects.
