MINCE IV. 对37颗贫金属和亚太阳金属量恒星的详细分析
MINCE IV. A detailed analysis of 37 metal-poor and subsolar metallicity stars
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中文总结 AI 辅助
本文详细分析了MINCE项目第四批37颗贫金属恒星的大气参数与26种元素丰度，结合运动学分类，结果支持银河系曾吸积矮星系的重大事件假说。
中文摘要 AI 辅助
名为“中等金属量中子俘获元素测量”（MINCE）的项目主要关注在金属量范围 $-2.5 \leq [\mathrm{Fe/H}] \leq -1.5$ 内的贫金属恒星的高质量光谱中若干中子俘获（NC）元素的光球层丰度，旨在提供其化学成分的同质信息。此外，基于盖亚（Gaia）任务，化学丰度现在可以与运动学性质相结合，从而能够研究银河系的组成子结构。我们分析了MINCE恒星第四批样本的大气参数和化学成分。然后将结果与先前分析的MINCE样本进行比较。观测使用位于伽利略国家望远镜（TNG）上的HARPS-N（分辨率 $R \approx 120\\,000$）和位于北欧光学望远镜（NOT）上的FIES（分辨率 $R \approx 67\\,000$）进行，提供了高信噪比（S/N）和高分辨率的光谱。然后我们使用先前MINCE工作中开发的方法和Gaia测光数据来获得恒星大气参数。化学丰度使用一维局域热动平衡（1D-LTE）模型大气进行分析。我们展示了37颗恒星中多达26种元素的光球层丰度，包括 $\alpha$ 元素、铁峰元素、轻奇数元素和10种中子俘获元素（Sr、Y、Zr、Ba、La、Ce、Pr、Nd、Sm和Eu）。为所有恒星提供了运动学性质和成员资格评估。因此，MINCE星表新增了13颗薄盘恒星、9颗厚盘恒星、1颗位于薄盘和厚盘之间过渡区的恒星、9颗晕族恒星和5颗Gaia-香肠-恩克拉多斯（Gaia-Sausage-Enceladus）恒星。结果与先前的MINCE工作非常吻合。与Gaia香肠恩克拉多斯星系化学演化（GCE）模型的比较与银河系曾发生来自矮星系的重大吸积事件的情景一致。
英文摘要
The project called Measuring at Intermediate metallicity Neutron-Capture Elements (MINCE) primarily focuses on the photospheric abundances of several neutron-capture (NC) elements from high-quality spectra of metal-poor stars within the metallicity range of ${\rm -2.5 \leq\![Fe/H]\!\leq -1.5}$, aiming to provide homogeneous information on their chemical compositions. Furthermore, based on the Gaia mission, chemical abundances can now be coupled with kinematic properties, enabling investigations of the constituent substructures of the Milky Way. We analyse the fourth sample of MINCE stars in terms of atmospheric parameters and chemical composition. The results are then compared with the previously analysed MINCE samples. The observations were conducted with HARPS-N (${\rm R \approx 120\,000}$) at the Telescopio Nazionale Galileo (TNG) and FIES (${\rm R \approx 67\,000}$ ) at the Nordic Optical Telescope (NOT), providing optical spectra with a high signal-to-noise ratio (S/N) and high resolution. We then used the methods developed in previous MINCE works and Gaia photometric data to obtain the stellar atmospheric parameters. The chemical abundances were analysed using 1D-LTE model atmospheres. We present the photospheric abundances in 37 stars of up to 26 elements, including $α$, iron-peak, light-odd, and 10 NC$-$elements (Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, and Eu). Kinematic properties and membership assessments are provided for all stars. The MINCE catalogue is thus expanded by 13 thin-disc stars, 9 thick-disc stars, 1 star in a transition zone between the thin and thick disc, 9 stars of the halo, and 5 Gaia-Sausage-Enceladus stars. The results agree excellently with previous MINCE works. The comparison with a Gaia Sausage Enceladus GCE model is consistent with the scenario of a major accretion event on the Milky Way from a dwarf galaxy.
发表机构
- Università degli Studi di Trieste（的里雅斯特大学）
- INFN – Sezione di Trieste（意大利国家核物理研究所的里雅斯特分部）
- INAF-Osservatorio Astronomico di Trieste（意大利国家天体物理研究所的里雅斯特天文台）
- Observatoire de Paris, Université PSL（巴黎天文台，巴黎文理研究大学）
- Universidad Andres Bello（安德烈斯贝洛大学）
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