球状星团帕特奇克125（Gran 3）的APOGEE-2S视图。来自高分辨率光谱学的新金属丰度和元素丰度
APOGEE-2S view of the globular cluster Patchick 125 (Gran 3). New metallicity and elemental abundances from high-resolution spectroscopy
摘要：
我们详细介绍了Patchick~125的元素丰度、径向速度和轨道根数，Patchick~125是最近在银河系凸起方向发现的贫金属球状星团（GC）。近红外高分辨率（$R\sim22,500$）光谱的两个成员获得了在第二阶段的阿帕奇点天文台星系演化实验在拉斯坎帕纳斯天文台作为第十六次数据发布（DR 16）的斯隆数字巡天。我们调查了四种化学物种的元素丰度，包括$α$ -（Mg，Si），Fe-峰（Fe）和奇数Z（Al）元素。我们发现金属丰度范围从[Fe/H] $= -1.69$到$-1.72$，这表明Patchick~125可能表现出平均金属丰度$\langle$ [Fe/H] $\rangle \sim -1.7$，与以前的低分辨率光谱分析相比，该簇的金属丰度显著增加。我们还发现了一个平均径向速度为95.9公里的$^{-1}$，这是$\sim$ 21.6公里的$^{-1}$高于文献报道。观测到的恒星表现出$α$ -富集（[Mg/Fe] $\lesssim+0.20$和[Si/Fe] $\lesssim +0.30$），遵循典型的贫金属GC趋势。在[Al/Fe] $\gtrsim +0.58$中，这两个成员星的铝丰度比都有所提高，这是GC中类似金属丰度的所谓“第二代”恒星的典型富集特征。这支持了Patchick~125中可能存在的多种群现象，以及其真正的GC性质。此外，Patchick~125显示了一个低能量，低偏心率（$<0.4$）和逆行轨道，被内星系捕获，靠近凸起的边缘。我们确认Patchick~125是一个真正的贫金属GC，目前被困在银河系核球附近。
英文摘要：
We present detailed elemental abundances, radial velocity, and orbital elements for Patchick~125, a recently discovered metal-poor globular cluster (GC) in the direction of the Galactic bulge. Near-infrared high-resolution ($R\sim22,500$) spectra of two members were obtained during the second phase of the Apache Point Observatory Galactic Evolution Experiment at Las Campanas Observatory as part of the sixteenth Data Release (DR 16) of the Sloan Digital Sky Survey. We investigated elemental abundances for four chemical species, including $α$- (Mg, Si), Fe-peak (Fe), and odd-Z (Al) elements. We find a metallicity covering the range from [Fe/H] $= -1.69$ to $-1.72$, suggesting that Patchick~125 likely exhibits a mean metallicity $\langle$[Fe/H]$\rangle \sim -1.7$, which represents a significant increase in metallicity for this cluster compared to previous low-resolution spectroscopic analyses. We also found a mean radial velocity of 95.9 km s$^{-1}$, which is $\sim$21.6 km s$^{-1}$ higher than reported in the literature. The observed stars exhibit an $α$-enrichment ([Mg/Fe]$\lesssim+0.20$, and [Si/Fe]$\lesssim +0.30$) that follows the typical trend of metal-poor GCs. The aluminum abundance ratios for the present two member stars are enhanced in [Al/Fe]$\gtrsim +0.58$, which is a typical enrichment characteristic of the so-called `second-generation' of stars in GCs at similar metallicity. This supports the possible presence of the multiple-population phenomenon in Patchick~125, as well as its genuine GC nature. Further, Patchick~125 shows a low-energy, low-eccentric ($<0.4$) and retrograde orbit captured by the inner Galaxy, near the edge of the bulge. We confirm that Patchick~125 is a genuine metal-poor GC, which is currently trapped in the vicinity of the Milky Way bulge.
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