论文标题
M31中的四个球状簇的化学组成和年龄，分析其综合光谱
Chemical composition and ages of four globular clusters in M31 from the analysis of their integrated-light spectra
论文作者
论文摘要
我们比较了M31（BOL 6，BOL 20，BOL 45和BOL 50）中四个球状簇（GC）的化学组成的结果（Maricheva M. 2021）。 M31中四个球状簇的综合光谱研究。天体。公牛。 76：389-404。 doi：https：//doi.org/10.1134/s199034132104009x），有关我们银河系和M31和M31的化学丰度的GC集成光谱的可用文献数据，以及两个星系中恒星的化学丰富性。簇及其文献类似物具有中等金属性-1.1 <[fe/h] <-0.75 dex和旧（10 Gyr）。使用高分辨率集成光谱法获得的M31中的Mg，Ca和C丰度高于M31中GC的文献估计值。使用文献数据，我们没有在Galaxy和M31中找到有关年龄，氦质量分数（Y）和化学组成的完整类似物。四个簇中的α元素丰度比[fe/h]〜-1 dex的银河场中的恒星平均值高约0.2个DEX。我们建议，这些和M. Maricheva（Maricheva M. 2021）关于所研究物体金属较低的发现比M31光环中的红色巨人的平均金属性以及alpha-process元素的平均金属的平均金属性相比，它们对应于M31内halo中的恒星中的平均值，这是M31内部halo的平均值，这是M31 halo的平均值，这是M31 halo的平均值。与Sne II爆发有关的纯净介质和暴力恒星形成事件的新鲜气体流入。
We compare the results on the chemical composition of four globular clusters (GCs) in M31 (Bol 6, Bol 20, Bol 45, and Bol 50) (Maricheva M. 2021). Study of integrated spectra of four globular clusters in M31. Astrophys. Bull. 76:389-404. doi: https://doi.org/10.1134/S199034132104009X) to the available literature data on integrated-light spectroscopy of GCs with similar ages and chemical abundances in our Galaxy and M31 and on the chemical abundances of stars in two galaxies. The clusters and their literature analogues are of moderate metallicity -1.1<[Fe/H]<-0.75 dex and old (10 Gyr). Mg, Ca, and C abundances of four GCs are higher than literature estimates for the GCs in M31 with [Fe/H]~-1 dex obtained using high-resolution integrated-light spectroscopy methods. Using literature data, we did not find complete analogues for the studied clusters in our Galaxy and M31 in terms of age, helium mass fraction (Y), and chemical composition. The alpha-element abundances in four clusters are about 0.2 dex higher than the average for stars in the Galactic field at [Fe/H]~-1 dex. We suggest that these and M. Maricheva's (Maricheva M. 2021) findings about lower metallicities of the studied objects than the average metallicity of red giants in the M31 halo and about the abundances of alpha-process elements in them corresponding to the average value for stars in the M31 inner halo likely indicate that the star formation process in the vicinity of M31 at the time of our sample cluster formation was complex with the inflow of fresh gas from the intergalactic medium and violent star forming events associated with SNe II bursts.
