Physical processes in stellar evolution

摘要: We firstly examine the possible roles of mass loss and mixing as a function stellar masses. Then we review present observational status about additional processes in massive stars. Various evidences from main-sequence OB stars, blue supergiants, SN 1987A Wolf-Rayet stars are given favour significant radiative zones rapidly rotating also particularly role on ratio Δ Y/Δ Z relative helium-to-metal enrichments. show that is far sufficient to explain high observed δ Y/ ratios. suggest swallowing heavy elements black holes occurs. In order account for ratios low HII regions, it necessary form above initial masses 20 {ie5-1}.