The first stars, also known as Population III stars, began the process of reionization in the Universe and contributed to the metal enrichment. It is believed that they might have been fast rotators, which can have significant consequences for their radiative, mechanical, and chemical feedback. In this talk, I will present recent models using the Geneva stellar evolution code (GENEC) with fast initial rotation velocity, corresponding to 70% of the critical one in the mass range of 9 to 120Msol. I will compare the outputs of these models with those obtained with lower initial rotations, focusing on the primary nitrogen production. Other aspects of the rapidly-rotating models will be discussed, including their impact on the early chemical evolution of galaxies. Moreover, I will discuss the possibility that rapidly-rotating Pop III stars may, at least in part, explain the high N/O ratios measured in certain high-redshift galaxies, such as GN-z11 and CEERS-1019.
1/02/2024
This is an invitation to the next INAF/OAPD seminar taking place Thursday, February 1st at 11:30.
The speaker is: Sophie Tsiatsiou (University Geneve)
The seminar can be attended in person in Sala Jappelli or remotely through the zoom link:
https://unipd.zoom.us/j/85273198731?pwd=V1ZiNE9ZWUN4ZTdIUzJsTFo0Z3U2Zz09
Meeting ID: 852 7319 8731
Passcode: 208186