The early generations of rotating massive stars and the origin of Carbon-Enhanced Metal-Poor stars
Arthur Choplin (甲南大学)
The study of the long-dead early generations of massive stars is crucial in order to obtain a complete picture of the chemical evolution of the Universe, hence the origin of the chemical elements. The nature of these stars can be inferred indirectly by investigating the origin of low-mass metal-poor stars observed in our Galaxy, some of which are almost as old as the Universe. The peculiar extremely iron-poor Carbon-Enhanced Metal-Poor (CEMP) stars, whose precise origin is still debated, are thought to have formed with the material ejected by only one or very few previous massive stars. After introducing the topic and reviewing some effects of axial rotation on massive stars, I will discuss how the physics — especially rotation — and the nucleosynthesis of the early generations of massive stars can be explored by combining stellar evolution modeling with observations of CEMP stars.
hongo-astrotalks (at-sign) astron.s.u-tokyo.ac.jp