论文标题
在银河磁盘中的金属梯度上
On the Metallicity Gradient in the Galactic Disk
论文作者
论文摘要
使用GAIA DR2改进的距离估计值，研究了银河磁盘中化学成分梯度的问题。在群集的平均金属性中观察到了明显的非单调变化，而半乳乳距离的距离增加。可以清楚地看到，在大约9.5 kpc的半乳酸距离内，在[Fe/h]中的金属跳跃似乎与银河磁盘最薄，最年轻的成分的外边界有关。在磁盘的内部（r <9 kpc）和外部（r> 10 kpc）区域中，没有明显的金属性梯度表明，在与所考虑的磁盘区域相对应的年龄相对应的时代，没有明显的金属富集。观察性数据表明，磁盘仅在Starburst时期经历明显的金属富集。在平均金属性和簇的年龄之间未发现明显的依赖性。
The problem of the chemical composition gradient in the galactic disk is studied based on a sample of metallicity estimates of open star clusters, using Gaia DR2-improved distance estimates. A clearly non-monotonic variation was observed in the average metallicity of clusters with increasing galactocentric distance. One can clearly see the metallicity jump of 0.22 in [Fe/H] at a Galactocentric distance of about 9.5 kpc, which appears to be linked to the outer boundary of the thinnest and youngest component of the galactic disk. The absence of a significant metallicity gradient in the internal (R<9 kpc) and external (R>10 kpc) regions of the disk demonstrates the absence of noticeable metal enrichment at times of the order of the ages corresponding to those of the disk regions under consideration. Observational data show that the disk experiences noticeable metal enrichment only during the starburst epochs. No significant dependence was found between the average metallicity and the age of the clusters.
