论文标题
大麦芽云中星团的详细化学丰度
Detailed Chemical Abundances of Star Clusters in the Large Magellanic Cloud
论文作者
论文摘要
We derive the first detailed chemical abundances of three star clusters in the Large Magellanic Cloud (LMC), NGC1831 (436+/-22 Myr), NGC1856 (350+/-18 Myr) and [SL63]268 (1230+/-62 Myr) using integrated-light spectroscopic observations obtained with the Magellan Echelle spectrograph on Magellan Baade望远镜。我们得出三个簇的[Fe/h]，[mg/fe]，[ti/fe]，[ca/fe]，[ni/fe]，[mn/fe]，[mn/fe]，[cr/fe]和[na/fe]。总体而言，我们的结果与文献中获得的LMC丰度以及通过详细的化学演化模型预测的LMC丰度相匹配。对于簇NGC1831和NGC1856，与[CA/FE]和[Ti/Fe]相比，[mg/fe]比率似乎略有耗尽。这可能暗示着以几种银河系的球状簇观察到的众所周知的Mg含量抗相关。但是，我们注意到，需要更高的信噪表观察来确认这种情况，尤其是对于NGC 1831。我们还发现，与LMC田间星星相比，群集[SL63] 268的集成光比[Na/fe]比率略有增强，可能会支持内含体现的含量变化。我们强调，需要对这些LMC簇中各个恒星进行详细的丰度分析以确认MSP的存在或不存在。
We derive the first detailed chemical abundances of three star clusters in the Large Magellanic Cloud (LMC), NGC1831 (436+/-22 Myr), NGC1856 (350+/-18 Myr) and [SL63]268 (1230+/-62 Myr) using integrated-light spectroscopic observations obtained with the Magellan Echelle spectrograph on Magellan Baade telescope. We derive [Fe/H], [Mg/Fe], [Ti/Fe], [Ca/Fe], [Ni/Fe], [Mn/Fe], [Cr/Fe] and [Na/Fe] for the three clusters. Overall, our results match the LMC abundances obtained in the literature as well as those predicted by detailed chemical evolution models. For clusters NGC1831 and NGC1856, the [Mg/Fe] ratios appear to be slightly depleted compared to [Ca/Fe] and [Ti/Fe]. This could be hinting at the well-known Mg-Al abundance anti-correlation observed in several Milky Way globular clusters. We note, however, that higher signal-to-noise observations are needed to confirm such a scenario, particularly for NGC 1831. We also find a slightly enhanced integrated-light [Na/Fe] ratio for cluster [SL63]268 compared to those from the LMC field stars, possibly supporting a scenario of intracluster abundance variations. We stress that detailed abundance analysis of individual stars in these LMC clusters is required to confirm the presence or absence of MSPs.
