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- Title
RADIOACTIVE CLOCKS AND THERMOMETER IN S-TYPE STARS.
- Authors
Van Eck, S.; Neyskens, P.; Jorissen, A.; Goriely, S.; Siess, L.; Plez, B.
- Abstract
Direct probes of the temporal evolution of stars are rare. We derive the time spent by S-type stars since the onset of the first thermal pulse, from the 99Tc - 99Ru and 93Zr - 93Nb chronometers. Zirconium and niobium abundances constrain as well the nucleosynthesis temperature, supporting 13C(α,n)16O as the s-process neutron source. Niobium abundances are used, for the first time, to efficiently separate stars with active nucleosynthesis from binary stars with fossil overabundances resulting from a previous mass transfer. The abundances of Tc, Nb, and Zr thus give access to the nucleosynthesis chronology and temperature, and provide a diagnostic of possible external pollution from a companion star.
- Subjects
RADIOACTIVE equilibrium; BINARY stars; MASS transfer; NIOBIUM; NUCLEOSYNTHESIS
- Publication
EAS Publications Series, 2015, Vol 71/72, p339
- ISSN
1633-4760
- Publication type
Article
- DOI
10.1051/eas/1571080