arXiv 1502.009432015-02-03astro-ph.SR

银河系球状星团的中分辨光谱和化学成分

Medium resolution spectroscopy and chemical composition of Galactic globular clusters

D. A. Khamidullina, M. E. Sharina, V. V. Shimansky, E. Davoust

备注：: 7 pages, 3 figures
发表信息：: Baltic Astronomy, Vol. 23, p. 260-266, 2014
DOI：: 10.1515/astro-2017-0189

摘要：

我们使用了6个银河系球状星团和模型恒星大气的积分光中分辨率光谱进行人口合成，并得出化学成分和年龄的集群。我们使用了Schiavon等人（2005）发表的球状星团的中等分辨率光谱，以及我们用上普罗旺斯天文台1.93米望远镜进行的长缝观测。将观测光谱与理论光谱进行了交互拟合。作为一个初始的方法，我们使用的质量，半径和日志g的恒星在集群中对应的最佳拟合等时线在观察到的颜色-星等图。根据Chabrier质量函数对计算出的恒星合成覆盖谱求和。为了改进年龄和氦含量的测定，分析了巴耳末吸收线的形状和深度。计算了Mg、Ca、C等元素的丰度。在化学成分和年龄方面与文献数据都有较好的一致性，这对发展恒星星族模型和更好地理解河外星团有一定的参考价值。

英文摘要：

We used integrated-light medium-resolution spectra of six Galactic globular clusters and model stellar atmospheres to carry out population synthesis and to derive chemical composition and age of the clusters. We used medium-resolution spectra of globular clusters published by Schiavon et al. (2005), as well as our long-slit observations with the 1.93 m telescope of the Haute Provence Observatory. The observed spectra were fitted to the theoretical ones interactively. As an initial approach, we used masses, radii and log g of stars in the clusters corresponding to the best fitting isochrones in the observed color-magnitude diagrams. The computed synthetic blanketed spectra of stars were summed according to the Chabrier mass function. To improve the determination of age and helium content, the shape and depth of the Balmer absorption lines was analysed. The abundances of Mg, Ca, C and several other elements were derived. A reasonable agreement with the literature data both in chemical composition and in age of the clusters is found. Our method might be useful for the development of stellar population models and for a better understanding of extragalactic star clusters.

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