Study Distribution Of Neutron-capture Elements Abundance In Stars

In this paper, we reproduce the n-capture elemental abundances observed in 92 stars (-3.29<[Fe/H]<-0.15). Based on the Galactic chemical evolution and neutron-capture element nucleosynthesis theories, we calculate the contributions of the respective main and weak s-process components as well as main and weak r-process components to the n-capture elemental abundances in the sample stars. Our work provide a theory model to determine the four processes relative contributions to the n-capture elemental abundances in the sample stars at various metallicities. And from this, we can know the characteristics and law of n-capture elemental abundances distributions in the stars.The paper is organized as follows:In the partâ… , based on the observation of main r-process stars, weak r-process stars and the solar neutron-capture elemental abundances respectively from main s-process, weak s-process, we firstly set up a parametric model about four components. Secondly, we fit the neutron-capture elemental abundances in 92 sample stars and provide the results , graphs, error , discussion and calculate the four components relative contributions to elements Sr ,Ba,Eu.In the partâ…¡, we summerize the results , draw the conclusion , point out defect of our model and future progress direction.The result shows that four-component model provide a feasible method to determine four-component contribution proportion . We can theoretically predicte the n-capture elemental abundances of stars at various mettallicities. Our calculation come down to neutron-capture element nucleosynthesis theories,the parametric model is meaning clear.