Investigation Of Astrophysical Origin Of The Elements In The Globular Cluster NGC6934

Globular clusters are born in the early years of galaxies,and the study of them helps us understand them better.The observations show that the abundance ratios of 18 elementsin globular cluster NGC 6934(including?-elements,Fe group elements and neutron capture elements)vary slightly with metallicity.In order to explore the astrophysical sources of stellar elements in NGC 6934,we use the five components model to fit the element abundance in the sample stars,and analyze the fitting results.The fitting results show that the main r-process coefficient is the highest implies the contribution of the main r-process to element abundance is the largest.The primary process coefficient is slightly lower than the main r-process coefficient,the contribution of the primary process to the elemental abundance is slightly lower than that of the main r-process.The contributions of the main s-process,secondary process and SNe Ia component to element abundance were lower than those of the previous two components.The contribution of these five components to the abundance of elements does not change as the metallicity [Fe/H] increases.The main r-process and primary-process component coefficients show a flat trend with the increase of metallicity,because the output of the main r-process and primary-process elements have primary characteristics.For ?-elements and Fe group elements in the sample stars,the primary process component contributed the most to elemental abundances.The primary,secondary and SNe Ia components remained basically unchanged with the increase of[Fe/H].Primary process is the main source of ?-elements and Fe group elements.The primary process component does not change with the metallicity.For neutron capture elements,the main r-process is dominant,the main s-process component contributes less slightly to the abundance of these elements than the main r-process component,and the weak r-process component contributes the least to the abundance of these elements.And with the increase of [Fe/H],the main r-process component and the weak r-process component remains basicallyunchanged,because the yield of both the main r-process and weak r-process have primary characteristics.Through photometric studies,Marino et al.(2018)found that globular cluster NGC 6934 has both characteristics of type I globular cluster and type II globular cluster.Marino et al.(2018)did not analyze the characteristics of globular cluster NGC 6934 from an elemental perspective.From the elemental abundances,we find that the contribution of primary process to NGC 6934 is the same as that to II-NGC5286,so the source of light elements is the same as that of II-NGC 5286.The contribution of main s-process to NGC 6934 is the same with that to I-M15,so the contribution of AGB stars to the elemental abundances of NGC 6934 is the same as thattoI-M15;Based on the abundance analysis,our conclusion drawn about globular cluster NGC 6934 is consistent with Marino et al.(2018).