论文标题
铝增强的金属贫困星埋在内部银河系中
Aluminum Enhanced Metal-Poor Stars buried in the Inner Galaxy
论文作者
论文摘要
具有较高铝和氮富集的恒星通常是几乎所有球状簇（GC）中多个种群化学构成的关键部分。还有令人信服的观察证据表明，某些银河系成分可能是由消散的GC部分建造的。因此，在金属贫穷的田间星中鉴定了这种恒星可能会提供有关银河系（MW）凸起和内部恒星光环的复合性质的见解，并揭示了其他化学特殊性。在这里，根据垂直光谱，我们报告发现29个温和金属贫困（[Fe/h] $ \ \ simsim-0.7 $）的星星，具有恒星气氛非常丰富铝（富含铝的恒星：[al/fe] $ \ gtrsim+0.5 $），远高于典型的solar solar solar the solar the solar the solar the solar the solar the solar solar the solar solar cultrius，这是一个高度埃奇的范围。轨道（$ e \ gtrsim0.6 $）。我们发现，在这项工作中几乎所有的化学物种都与GC的化学模式一起发现了许多相似之处，因此我们猜想它们可能已动态地弹出凸起和内部光环中的gcs和/或GC形成的GC和/或GC在已知合并事件的不同祖细胞中形成的MW经历的MW经历的\ textit cextit ceaia and sequia anc/secia-sasage anc/secia} -sAausage。
Stars with higher aluminum and nitrogen enrichment are often the key pieces for the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also compelling observational evidence that some Galactic components could be partially built from dissipated GCs. Thus, the identification of such kinds of stars among metal-poor field stars may provide insights on the composite nature of the Milky Way (MW) bulge and inner stellar halo, as well as reveal other chemical peculiarities. Here, based on APOGEE spectra, we report the discovery of 29 mildly metal-poor ([Fe/H]$\lesssim-0.7$) stars with stellar atmospheres strongly enriched in aluminum (Al-rich stars: [Al/Fe]$\gtrsim+0.5$), well above the typical Galactic levels, located within the Solar radius toward the bulge region, which lies in highly eccentric orbits ($e\gtrsim0.6$). We find many similarities for almost all of the chemical species measured in this work with the chemical patterns of GCs, so we conjecture that they have likely been dynamically ejected into the bulge and inner halo from GCs formed in situ and/or GC formed in different progenitors of known merger events experienced by the MW, such as the \textit{Gaia}-Sausage-Enceladus and/or Sequoia.
