Ceci n 'est pas a球状星团：恒星系统Terzan 5的金属丰度分布
Ceci n'est pas a globular cluster: the metallicity distribution of the stellar system Terzan 5
摘要：
我们提出了新的测定铁丰度的220颗恒星属于恒星系统泰山5在银河系的隆起。光谱是由欧洲南方天文台甚大望远镜的火焰和凯克II望远镜的DEIMOS获得的。这是迄今为止在这个恒星系统中观测到的最大的恒星光谱样本。从这个数据集，一个子样本的光谱不受TiO波段的目标提取和统计净化场星。一旦与我们小组先前公布的34颗其他恒星相结合，覆盖系统整个径向范围的135颗成员星的总样本已被用于确定Terzan 5的金属丰度分布函数。铁的分布清楚地显示出三个峰值：在[Fe/H] $\simeq0.25$ dex处的超太阳组分，占样品的29%，在[Fe/H] $\simeq-0.30$ dex处的占主导地位的亚太阳群体，对应于总量的62%，以及在[Fe/H] $\simeq-0.8$ dex处的次要（6%）贫金属组分。如此广泛的多模态金属丰度分布表明，泰山5不是一个真正的球状星团，而是一个复杂得多的恒星系统的残余。
英文摘要：
We present new determinations of the iron abundance for 220 stars belonging to the stellar system Terzan 5 in the Galactic bulge. The spectra have been acquired with FLAMES at the Very Large Telescope of the European Southern Observatory and DEIMOS at the Keck II Telescope. This is by far the largest spectroscopic sample of stars ever observed in this stellar system. From this dataset, a subsample of targets with spectra unaffected by TiO bands was extracted and statistically decontaminated from field stars. Once combined with 34 additional stars previously published by our group, a total sample of 135 member stars covering the entire radial extent of the system has been used to determine the metallicity distribution function of Terzan 5. The iron distribution clearly shows three peaks: a super-solar component at [Fe/H]$\simeq0.25$ dex, accounting for 29% of the sample, a dominant sub-solar population at [Fe/H]$\simeq-0.30$ dex, corresponding to 62% of the total, and a minor (6%) metal-poor component at [Fe/H]$\simeq-0.8$ dex. Such a broad, multi-modal metallicity distribution demonstrates that Terzan 5 is not a genuine globular cluster but the remnant of a much more complex stellar system.
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