| Seminar: | CPS Seminar |
| date: | 2025 October 16 (Thu) 13:00- |
| Room: | CPS Conference Room and Online (Hybrid meeting) |
| Speaker: | HIRAI Yutaka (Junior Associate Professor, Tohoku University of Community Service and Science (Koeki University)) |
| Title: | "Formation of the Metal-poor Stars Explored by Galaxy Formation Simulations" |
| Abstract: | Chemical abundances of metal-poor stars are the fossil records of galaxy formation in the early Universe. Large surveys have recently measured the chemical abundances of metal-poor stars in the Milky Way and its satellites. However, it is still difficult to correctly extract the information on the formation sites and ages of metal-poor stars from these observations. In this talk, I will discuss the formation of the metal-poor stars using our galaxy formation simulations. We have shown that most metal-poor stars enhanced in elements heavier than iron are formed in dwarf galaxies, which are accreted to the Milky Way, in the early Universe using our cosmological zoom-in simulation of a Milky Way-like galaxy. From this simulation, we find that remnants of episodic star formation in satellite galaxies in the early Universe can be observed with a group of metal-poor stars with similar chemical abundances. These results give us clues to understand the Milky Way formation in the early Universe to the present from the chemical abundances of metal-poor stars. |
| Keywords: | metal-poor stars, Milky Way Galaxy, satellite galaxies, chemical abundances |
| Organizer: | SAITOH Takayuki |