×ばつ 10<SUP>-3</SUP> M <SUB>⊙</SUB> yr<SUP>-1</SUP>) and wind velocity (1-100 km s<SUP>-1</SUP>). We also find that the acceleration of the wind, driven by newly formed dust, suppresses the grain growth but still allows more than half of the gas-phase carbon to finally be locked up in dust grains. These results indicate that, at most, 1.7 M <SUB>⊙</SUB> of carbon grains can form during the RSG phase of 500 M <SUB>⊙</SUB> Population III stars. Such a high dust yield could place very massive primordial stars as important sources of dust at the very early epoch of the universe if the initial mass function of Population III stars was top-heavy. We also briefly discuss a new formation scenario of carbon-rich ultra-metal-poor stars, considering feedback from very massive Population III stars.">
×ばつ 10<SUP>-3</SUP> M <SUB>⊙</SUB> yr<SUP>-1</SUP>) and wind velocity (1-100 km s<SUP>-1</SUP>). We also find that the acceleration of the wind, driven by newly formed dust, suppresses the grain growth but still allows more than half of the gas-phase carbon to finally be locked up in dust grains. These results indicate that, at most, 1.7 M <SUB>⊙</SUB> of carbon grains can form during the RSG phase of 500 M <SUB>⊙</SUB> Population III stars. Such a high dust yield could place very massive primordial stars as important sources of dust at the very early epoch of the universe if the initial mass function of Population III stars was top-heavy. We also briefly discuss a new formation scenario of carbon-rich ultra-metal-poor stars, considering feedback from very massive Population III stars.">
×ばつ 10<SUP>-3</SUP> M <SUB>⊙</SUB> yr<SUP>-1</SUP>) and wind velocity (1-100 km s<SUP>-1</SUP>). We also find that the acceleration of the wind, driven by newly formed dust, suppresses the grain growth but still allows more than half of the gas-phase carbon to finally be locked up in dust grains. These results indicate that, at most, 1.7 M <SUB>⊙</SUB> of carbon grains can form during the RSG phase of 500 M <SUB>⊙</SUB> Population III stars. Such a high dust yield could place very massive primordial stars as important sources of dust at the very early epoch of the universe if the initial mass function of Population III stars was top-heavy. We also briefly discuss a new formation scenario of carbon-rich ultra-metal-poor stars, considering feedback from very massive Population III stars."/>