Heavy Element Contributions Of Rotating Massive Stars To Interstellar Medium

Massive stars affect the structure and composition of the interstellar medium(ISM)in galaxies,the formation and evolution of stars,planets and galaxies,including physical evolution and chemical evolution.The observed physical characteristics have a profound impact and research significance.When the massive stars evolve to the final stage,gas and dust will be thrown into the ISM,and the gas and dust clouds in the ISM collapse under gravity to form stars,so ISM is an important source of star formation,and stars can also regulate gas structure,and affect the rate of star formation.Employing the the stellar evolution code(Modules for Experiments in Stellar Astrophysics),we calculate yields of heavy elements from massive stars via stellar wind and core-collapse supernovae(CCSN)ejecta to interstellar medium(ISM).In our models,the initial masses(Mini)of massive stars are taken from 13 to 80M?,their initial rotational velocities(V)are 0,300 and 500 km s^-1,and their metallicities are[Fe/H]=-3,-2,-1,and 0.The yields of heavy elements coming from stellar winds are mainly affected by the stellar rotation which changes the chemical abundances of stellar surfaces via chemically homogeneous evolution,and enhances mass-loss rate.We estimate that the stellar wind can produce heavy element yields of about 10^-2(for low metallicity models)to several M?(for low metallicity and rapid rotation models)mass.The yields of heavy element produced by CCSN ejecta also depend on the remnant mass of massive mass which is mainly determined by the mass of CO core.Our models calculate that the yields of heavy elements produced by CCSN ejecta can get up to several M?mass.Compared with stellar wind,CCSN ejecta has a greater contribution to the heavy elements in ISM.We also compare the ⁵⁶Ni yields by calculated in this work with observational estimate.Our models only explain the ⁵⁶Ni masses produced by faint supernova(SNe)or normal SNe with progenitor mass lower than about 25M?.