The light-weighted age and metallicity of Galactic globular clusters

The light-weighted age and metallicity of Galactic globular clusters
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银河球状星团的轻量级年龄和金属丰度

DOI:
10.1007/s10509-010-0309-y
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发表时间:
2010-02
影响因子:
1.9
通讯作者:
Zhang, Yu
Zhang, Yu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zhang, Fenghui;Han, Zhanwen;Liu, Jinzhong;Zhang, Yu

文献摘要

参考文献

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随着大量高质量光谱数据和全光谱拟合方法的出现,光谱合成正在进入一个新时代。建立STARLIGHT代码(全光谱拟合代码,Cid Fernandes等人(Mon.没有R. Astron.Soc.358:363,2005))适用于研究各种类型星系的性质,对星系研究至关重要。在测试这种可能性时,银河系球状星团(GCs)提供了一个很好的媒介。160:163,2005),并获得最能代表其复合性质的恒星种群的混合物。通过分析恒星年龄和金属丰度的分布,发现恒星金属丰度分布集中在一个低值处,恒星年龄分布非常分散。为了与文献进行比较,我们还计算了GC的轻重量年龄和金属丰度,我们发现轻重量金属丰度与文献一致,而轻重量年龄低于文献。这表明STARLIGHT可用于获得GC的金属丰度。
Spectra synthesis is entering a new era with the availability of large and high-quality spectroscopic data and full spectrum fitting methods. Establishing the reliability whether the STARLIGHT code (a full spectrum fitting code, Cid Fernandes et al. (Mon. Not. R. Astron. Soc. 358:363, 2005)) is suitable to study the properties of various types of galaxies is vital to galaxy study. In testing this possibility, Galactic globular clusters (GCs) provide an excellent medium.Taking the 40 Galactic GCs as an example in our work, we analyze their integrated spectra from Schiavon et al. (Astrophys. J. Suppl. 160:163, 2005) and obtain their mixtures of stellar populations that best represents their composite nature. Through analyzing the distributions of stellar ages and metallicities respectively, we find that the stellar metallicity distribution is centered at a low value and the stellar age distribution is very scattered. To compare with the literature, we also calculate the light-weighted ages and metallicities of GCs, and we find that the light-weighted metallicities agree with the literature, while the light-weighted ages are lower than those of the literature. This demonstrates that STARLIGHT can be used to obtain the metallicities of GCs.
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