s-Process abundances in AGB stars at various metallicities and their theoretical interpretation

✍ Scribed by M. Busso; R. Gallino

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 228 KB
• Volume: 621
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00285-6

✦ Synopsis

Results from existing models of s-processing in red giants are compared with key observed abundances in population I and II AGB stars. Population I giants are particularly important for getting constraints on the neutron density (from Rb/Sr ratios), while population II AGB's provide clues to understand how the neutron exposure is achieved (through the ratio between Ba-peak and Sr-peak elements). AGB stars are shown to require s-processing with a very low neutron density, and producing very high Ba/Sr ratios at low metallicities. Both features are typical of radiative 13C-burning phases in AGB stars.