Evolution and Nucleosynthesis of Massive Stars

Meynet, Georges; Maeder, André; Choplin, Arthur; Takahashi, Koh; Ekström, Sylvia; Hirschi, Raphael; Chiappini, Cristina; Eggenberger, Patrick

Abstract

Massive stars are rapid nuclear reactors that play a key role in injecting new synthesized elements in the interstellar medium. Depending on the strengths of the stellar winds on the efficiency of mixing processes, the masses and the chemical compositions of their ejecta can be dramatically different. In a first part, we describe two types of rotating models differing by the physics involved and discussing various consequences. In a second part, we focus on the impacts of rotation in massive stars at very low metallicity. Various nucleosynthetic signatures pointing towards the need for some extra-mixing in the first generation of stars are presented. This extra-mixing has great chance to be driven by rotation for the following reasons: 1) when the metallicity decreases, the formation of fast rotators seem to be favored; 2) rotational mixing is more efficient at low metallicities; 3) primary nitrogen is produced only at low metallicities a fact that can be well explained by more efficient rotational mixing at low metallicities.

Citation

Meynet, G., Maeder, A., Choplin, A., Takahashi, K., Ekström, S., Hirschi, R., Chiappini, C., & Eggenberger, P. (2016, June). Evolution and Nucleosynthesis of Massive Stars. Presented at Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016), Niigata, Japan

• Presentation Conference Type: Conference Paper (published)
• Conference Name: Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)
• Start Date: Jun 19, 2016
• End Date: Jun 24, 2016
• Publication Date: Feb 28, 2017
• Deposit Date: Jun 15, 2023
• Publisher: Physical Society of Japan 日本物理学会
• DOI: https://doi.org/10.7566/jpscp.14.010401
• Public URL: https://keele-repository.worktribe.com/output/467868