AI 中文总结
本研究通过对133个疏散星团中655颗巨星的红外APOGEE MWM光谱再分析，推导18种元素的径向丰度梯度，发现金属丰度随银心距增大而降低，斜率近-0.06 dex/kpc，10-11 kpc外适度变平，还新增V等4种元素的梯度。
AI 中文摘要
疏散星团是研究银河系的强大工具。尽管大型光谱巡天现已为众多星团成员提供了光谱，但自动化管道和异源成员选择可能会引入系统误差并夸大表观星团的弥散。因此，开展一次经过严格成员控制、明确处理局地热力学平衡偏离的均质再分析，对于建立可靠的丰度梯度具有重要价值。本研究旨在利用疏散星团巨星推导多种元素的精确银河系径向丰度梯度，并探究这些梯度如何依赖于星团年龄。我们对斯隆数字巡天DR19中来自盖亚数据、且满足严格信噪比质量筛选条件的655颗疏散星团成员，重新分析了高分辨率红外APOGEE银河系Mapper（MWM）光谱。采用Python版本的Spectroscopy Made Easy进行光谱拟合，以获取恒星参数和18种元素的丰度，并对若干关键原子物种应用了非局地热力学平衡修正。通过对所有拟合合成光谱的目视检查，对结果进行了进一步质量控制。星团的金属丰度随银心距增大而降低，整体斜率接近-0.06 dex/kpc，在10-11 kpc之外存在适度变平。除了Otto等人2026年研究中分析的元素外，我们还利用APOGEE光谱推导了V、Cu、Zn和Yb的疏散星团丰度梯度。
英文摘要
Open clusters are powerful tools for studying the Milky Way. While large spectroscopic surveys now provide spectra for many cluster members, automated pipelines and heterogeneous membership selections can introduce systematics and inflate apparent cluster scatter. Therefore, a homogeneous re-analysis with careful membership control and an explicit treatment of departures from Local Thermodynamic Equilibrium is valuable for establishing robust abundance gradients. The aim is to derive precise Galactic radial abundance gradients for multiple elements using open cluster giants, and to investigate how these gradients depend on cluster age. We re-analysed high-resolution infrared APOGEE Milky Way Mapper spectra from DR19 of the Sloan Digital Sky Survey for 655 open cluster members selected from Gaia data that satisfied strict quality cuts on signal-to-noise ratio. Stellar parameters and 18 elemental abundances were obtained using spectrum fitting with the Python version of Spectroscopy Made Easy, applying Non-Local Thermodynamic Equilibrium corrections for several key atomic species. Further quality control of the results was made by visual inspection of all fitted synthetic spectra. The metallicity of the clusters decreases with Galactocentric radius, following a global slope close to -0.06 dex/kpc. Beyond 10-11 kpc, there is modest flattening. In addition to the elements analysed in the \cite{otto2026} study, we derive open-cluster gradients for V, Cu, Zn and Yb using APOGEE spectra.
Comments18 pages, 11 figures, Accepted
Journal refAstronomy and Astrophysics, 2026
