Pop III hypernova nucleosynthesis and abundance trends in extremely metal-poor halo stars Original Research Article

We calculate evolution and nucleosynthesis in massive Pop III stars with M = 13 ∼ 270M⊙ and compare the results with abundances of very metal-poor halo stars. The observed abundances can be explained by the energetic core-collapse supernovae with M ⪅ 130M⊙ (“hypernovae”) but not by pair-instability supernovae (PISNe) with M ∼ 140–270M⊙. This result constrains the IMF for the Pop III and very metal-poor Pop II stars.