标题： 银河盘中的疏散星团中氧和钠的丰度模式 显示英文标题

标题： O and Na abundance patterns in open clusters of the Galactic disk

摘要： 目标。 球状星团中观测到O-Na丰度反相关性，而在银河场星中不存在这种现象。疏散星团被认为在化学成分上是内部均匀的。我们旨在探索银河盘中疏散星团群体的O和Na丰度模式。 方法。 我们将文献中的高分辨率光谱研究得到的疏散星团O和Na丰度比结合起来，并将其归一化到共同的太阳标度。我们将疏散星团的丰度与球状星团和盘面场星进行比较。 结果。 我们发现不同的环境表现出不同的丰度模式。疏散星团在极端O耗尽/Na增强方面并未显示出与球状星团相似的O-Na反相关性。此外，疏散星团中的高Na丰度也不符合盘面场星的情况。如果真实存在，这可能表明现今疏散星团的溶解并不是构建银河盘的重要贡献因素。大规模的均匀研究将进一步确认Na增强的真实性。 显示英文摘要

摘要： Aims. A global O-Na abundance anti-correlation is observed in globular clusters, which is not present in the Galactic field population. Open clusters are thought to be chemically homogeneous internally. We aim to explore the O and Na abundance pattern among the open cluster population of the Galactic disk. Methods. We combine open cluster abundance ratios of O and Na from high-resolution spectroscopic studies in the literature and normalize them to a common solar scale. We compare the open cluster abundances against the globular clusters and disk field. Results. We find that the different environments show different abundance patterns. The open clusters do not show the O-Na anti-correlation at the extreme O-depletion / Na-enhancement as observed in globular clusters. Furthermore, the high Na abundances in open clusters do not match the disk field stars. If real, it may be suggesting that the dissolution of present-day open clusters is not a significant contribution to building the Galactic disk. Large-scale homogeneous studies of clusters and field will further confirm the reality of the Na enhancement.