Nucleosynthesis in early rotating massive stars and chemical composition of CEMP stars

Choplin, A; Hirschi, R

Abstract

The first massive stars triggered the onset of chemical evolution by releasing the first metals (elements heavier than helium) in the Universe. The nature of these stars and how the early chemical enrichment took place is still largely unknown. Rotational-induced mixing in the stellar interior can impact the nucleosynthesis during the stellar life of massive stars and lead to stellar ejecta having various chemical compositions. We present low and zero-metallicity 20, 25 and 40 M⊙ stellar models with various initial rotation rates and assumptions for the nuclear reactions rates. With increasing initial rotation, the yields of light (from ∼ C to Al) and trans-iron elements are boosted. The trans-iron elements (especially elements heavier than Ba) are significantly affected by the nuclear reaction uncertainties. The chemical composition of the observed CEMP (carbon-enhanced metal-poor) stars CS29528-028 and HE0336+0113 are consistent with the chemical composition of the material ejected by a fast rotating 40 M⊙ model.

Citation

Choplin, A., & Hirschi, R. (2020). Nucleosynthesis in early rotating massive stars and chemical composition of CEMP stars. Journal of Physics: Conference Series, 1668(1), Article 012006. https://doi.org/10.1088/1742-6596/1668/1/012006

• Journal Article Type: Conference Paper
• Conference Name: Nuclear Physics in Astrophysics IX (NPA-IX), 15-20 September 2019
• Conference Location: Frankfurt, Germany
• Publication Date: Oct 1, 2020
• Deposit Date: Jun 16, 2023
• Journal: Journal of Physics: Conference Series
• Print ISSN: 1742-6588
• Electronic ISSN: 1742-6596
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 1668
• Issue: 1
• Article Number: 012006
• DOI: https://doi.org/10.1088/1742-6596/1668/1/012006
• Keywords: General Physics and Astronomy
• Additional Information: Article Title: Nucleosynthesis in early rotating massive stars and chemical composition of CEMP stars; Journal Title: Journal of Physics: Conference Series; Article Type: paper; Copyright Information: Published under licence by IOP Publishing Ltd; Date Received: ; Date Accepted: ; Online publication date: