We report the APOGEE-2S+ discovery of a unique collection of nitrogen-enhanced mildly metal-poor giant stars, peaking at [Fe/H] ∼ −0.89 with no carbon enrichment, toward the Small and Large Magellanic Clouds (SMC and LMC), with abundances of light- (C, N), odd-Z (Al, K), and α -elements (O, Mg, Si) that are typically found in Galactic globular clusters (GCs). Here we present 44 stars in the SMC and LMC that exhibit significantly enhanced [N/Fe] abundance ratios, well above ([N/Fe] ≳ +0.6) typical Galactic levels at similar metallicity, and a star that is very nitrogen-enhanced ([N/Fe] > +2.45). Our sample consists of luminous evolved stars on the asymptotic giant branch (AGB), eight of which are classified as bona fide semi-regular (SR) variables, as well as low-luminosity stars similar to those of stars on the tip of the red giant branch of stellar clusters in the SMC and LMC. It seems likely that whatever nucleosynthetic process is responsible for these anomalous SMC ...

中文翻译：

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在麦哲伦星云中发现大量的氮增强恒星

我们报告了APOGEE-2S +发现的独特集合，该集合具有氮增强的轻金属贫乏巨型恒星，其朝着小和大麦哲伦星云（SMC和LMC）的峰值在[Fe / H]〜-0.89且无碳富集，具有大量在银河系球状星团（GC）中发现的光（C，N），奇数Z（Al，K）和α-元素（O，Mg，Si）。在这里，我们在SMC和LMC中呈现44颗恒星，它们在相似的金属度下表现出显着增强的[N / Fe]丰度比，远高于（[N / Fe]≳+0.6）典型的银河能级，并且其氮原子非常增强（[N / Fe]> +2.45）。我们的样本由渐近巨型分支（AGB）上的发光演化恒星组成，其中八颗归类为善意半规则（SR）变量，以及与SMC和LMC中恒星团红色巨型分支尖端的恒星相似的低光度恒星。似乎任何核合成过程都是导致这些异常SMC的原因...