Investigation Of Astrophysical Origin Of The Elements In The Globular Cluster NGC 4833

The element abundances of stars provide very important information for us to understand the formation and evolution of stars and galaxies,so exploring the origin of the element abundances of stars is an important content of nuclear astrophysics.The astrophysical sources of elements are various and the process is extremely complex,so the observed abundance of stars can not be explained by a single nuclear synthesis process.In this paper,the element abundances of NGC 4833 are decomposed by using component model,and the results are analyzed and discussed.Globular clusters were formed in the early universe period.Their element abundance and other information can help us understand the environment and evolution in the early stage of the universe.Globular cluster NGC 4833 is a relatively bright globular cluster in the galaxy,which has existed for at least 6.4 billion years.When comparing the abundance of neutron capture elements in NGC 4833 with r-process and s-process,it is found that a single nuclear synthesis process is not enough to explain the source of its neutron capture elements.We use the component calculation model to calculate and fit the abundance of neutron capture elements of sample stars.At the same time,the sources of all neutron capture elements are analyzed in detail.We found that the sources of neutron capture elements in NGC 4833 include: Main r-process,weak r-process and main s-process(some elements,such as Eu,have only two process contributions,which is determined by the model).The main source of the light neutron capture element is the weak r-process,and the main source of the heavy neutron capture element is the main r-process.The main s-process runs through the whole neutron capture process of NGC 4833,which can not be ignored in the formation and evolution of stars.In this paper,15 sample stars of globular cluster NGC 4833 are selected,but the data of these sample stars cover most of the spectral range of NGC 4833.The abundance of these 15 sample stars is basically the same,which indicates that these heavy elements have experienced approximately the same evolution process.We use the component calculation model to decompose the neutron capture elements of NGC 4833,give the trend of the contribution of each component with the metal abundance,and compare the conclusion with the previous research,then demonstrate the chemical evolution and astrophysical source of the neutron capture elements of NGC 4833.