Study On The Decomposition Of Metallicity Abundance Of Fornax Dwarf Galaxy And The Milky Way

The element abundance of stars contains important information about the evolution of the universe,and the multi-component can further analyze the specific source of star element abundance.We use three components to fit the element abundances of 313metal-poor stars in the Milky Way.The fitting effect of the three components on the abundance of metal-poor stars in the Milky Way is obtained.The three components of the element abundance contribution source of the 232 metal-poor stars with good fitting are analyzed in detail: main r-process,weak r-process and initial or prompt process.We find that the contribution of weak r-process to the abundance of stars in the Milky Way gradually rises in the extremely metal-poor,and there is an upper limit on the progenitor mass of supernovae that produce weak r-process.We also used four components to perform a fitting analysis on some of the sample stars in the Milky Way that have s-process.Seventeen Pb stars were found out of the 313 metal-poor sample stars in the Milky Way.After reselecting the abundance of the main s-process,the Pb fitting situation has been well improved.We used five components to fit the element abundances of 47metal-poor stars in the Fornax Dwarf Galaxy,and obtained the trend of the contribution of individual components with metallicities.It is found that the contribution ratio of SNe Ia to ? elements and iron group elements in the Fornax Dwarf Galaxy is increasing with the increase of metallicity abundance.And the contribution of the initial or prompt process to? elements,iron group elements and light neutron capture elements continues to decrease with the increase of metallicity abundance.The contribution of stellar abundance in the Fornax Dwarf Galaxy mainly came from massive stars in the early stage.With the increase of metal abundance,the contribution of SNe Ia to the abundance of stars is gradually increasing.