Conférence de Falk Herwig, University of Victoria
Résumé
Highly non-solar, anomalous abundance distributions can be found in numerous astrophysical observations, such as H-deficient post-AGB stars, C-enhanced metal-poor stars and pre-solar grains extracted from meteorites. These abundance signatures provide a window into individual nuclear production sites that create the elements. The above examples all provide insight into the intermediate neutron capture process that occurs in the convective-reactive environment of proton-rich material that is ingested into C12-rich convective He-shell burning. New large-scale, 3-D simulations of the turbulent entrainment and energetic nuclear feedback processes of H-ingestion reveal a previously unknown global oscillation, and demonstrate that traditional stellar evolution simulations are breaking down in this regime. Preliminary i-process abundance predictions show a surprising agreement with the previously poorly explained CEMP-s+r stars, indicating that this exotic neutron-capture process may play an important role in the early universe.
Présentée par le Groupe Astronomie et astrophysique du Département de physique de l'Université de Montréal. Cette conférence est destinée à des spécialistes dans le domaine de l'astrophysique et sera donnée en anglais.
