Raphael Hirschi r.hirschi@keele.ac.uk
Mass loss and very low-metallicity stars
Hirschi, Raphael; Chiappini, Cristina; Meynet, Georges; Ekstrom, Sylvia; Maeder, Andre
Authors
Cristina Chiappini
Georges Meynet
Sylvia Ekstrom
Andre Maeder
Abstract
Mass loss plays a dominant role in the evolution of massive stars at solar metallicity. After discussing different mass loss mechanisms and their metallicity dependence, we present the possibility of strong mass loss at very low metallicity. Our models at Z=1e-8 show that stars more massive than about 60 solar masses may lose a significant fraction of their initial mass in the red supergiant phase. This mass loss is due to the surface enrichment in CNO elements via rotational and convective mixing. Our 85 solar mass model ends its life as a fast rotating WO type Wolf-Rayet star. Therefore the models predict the existence of type Ic SNe and long and soft GRBs at very low metallicities. Such strong mass loss in the red supergiant phase or the Omega-Gamma limit could prevent the most massive stars from ending as pair-creation supernovae.
The very low metallicity models calculated are also very interesting from the nucleosynthesis point of view. Indeed, the wind of the massive star models can reproduce the CNO abundances of the most metal-poor carbon-rich star known to date, HE1327-2326. Finally, using chemical evolution models, we are able to reproduce the evolution of CNO elements as observed in the normal extremely metal poor stars.
Citation
Hirschi, R., Chiappini, C., Meynet, G., Ekstrom, S., & Maeder, A. (2007). Mass loss and very low-metallicity stars. AIP conference proceedings, 948, 397–404. https://doi.org/10.1063/1.2818999
Journal Article Type | Conference Paper |
---|---|
Conference Name | UNSOLVED PROBLEMS IN STELLAR PHYSICS: A Conference in Honor of Douglas Gough |
Conference Location | Cambridge (UK) |
Online Publication Date | Nov 9, 2007 |
Publication Date | Nov 9, 2007 |
Deposit Date | Jul 7, 2023 |
Publicly Available Date | Jul 7, 2023 |
Journal | AIP Conference Proceedings |
Print ISSN | 0094-243X |
Electronic ISSN | 1551-7616 |
Publisher | AIP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 948 |
Pages | 397–404 |
DOI | https://doi.org/10.1063/1.2818999 |
Keywords | Astrophysics, Nucleosynthesis, Stellar population, Giant stars, Supernovae, Wolf Rayet stars, Photon scattering, Chemical elements |
Files
This file is under embargo until Jul 7, 2023 due to copyright reasons.
Contact s.martin1@keele.ac.uk to request a copy for personal use.
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