论文标题
金属贫困球状簇NGC 2298
APOGEE-2S Mg-Al anti-correlation of the Metal-Poor Globular Cluster NGC 2298
论文作者
论文摘要
我们根据近红外高分辨率（$ r \ sim $ \ sim $ 22,500）在Apache Pointeratoration Pointeration coptoration comperiment（apevoration-apoge-couste of Sever of Severtion op Apevoration compoge-everseption op Apevoration-apoge-evertriment op op Apevoration-apoge-evertriment op Opaveratoration-apoge-evertriment op Apevoration-sever（apoge）sever（apoge-apoge-2 17）斯隆数字天空调查IV（SDSS-IV）。 We employ the Brussels Automatic Code for Characterizing High accuracy Spectra (\texttt{BACCHUS}) software to investigate abundances for a variety of species including $α$-elements (Mg, Si, and Ca), the odd-Z element Al, and iron-peak elements (Fe and Ni) located in the innermost regions of NGC 2298. We find a mean and median metallicity [Fe/H] $ = -1.76 $和$ -1.75 $，星到明星差为0.14 DEX，与内部测量错误兼容。因此，我们没有发现NGC 2298中固有的Fe丰度扩散的证据。典型的$α-$元素在NGC 2298中富集相对于太阳而言过多，并且遵循其他金属贫困GC的趋势。我们证实了该群集中具有增强的人群的存在，该集群显然与MG抗相关，表明NGC 2298中多重人口现象的流行率。
We present detailed elemental abundances and radial velocities of stars in the metal-poor globular cluster (GC) NGC 2298, based on near-infrared high-resolution ($R\sim$ 22,500) spectra of twelve members obtained during the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) at Las Campanas Observatory as part of the seventeenth Data Release (DR 17) of the Sloan Digital Sky Survey IV (SDSS-IV). We employ the Brussels Automatic Code for Characterizing High accuracy Spectra (\texttt{BACCHUS}) software to investigate abundances for a variety of species including $α$-elements (Mg, Si, and Ca), the odd-Z element Al, and iron-peak elements (Fe and Ni) located in the innermost regions of NGC 2298. We find a mean and median metallicity [Fe/H] $ = -1.76$ and $-1.75$, respectively, with a star-to-star spread of 0.14 dex, compatible with the internal measurement errors. Thus, we find no evidence for an intrinsic Fe abundance spread in NGC 2298. The typical $α-$element enrichment in NGC 2298 is overabundant relative to the Sun, and follows the trend of other metal-poor GCs. We confirm the existence of an Al-enhanced population in this cluster, which is clearly anti-correlated with Mg, indicating the prevalence of the multiple-population phenomenon in NGC 2298.
