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| Paper: |
Nucleosynthesis in AGB Stars Traced by Oxygen Isotopic Ratios |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
289 |
| Authors: |
De Nutte, R.; Decin, L.; Olofsson, H.; de Koter, A.; Lombaert, R.; Milam, S.; Ramstedt, S. |
| Abstract: |
Isotopic ratios are by far the best diagnostic tracers of the stellar
origin of elements, as they are very sensitive to the precise
conditions in the nuclear burning regions. They allow us to give
direct constraints on stellar evolution models and on the progenitor
mass. However, up to now different isotopic ratios have been well
constrained for only a handful of Asymptotic Giant Branch (AGB) stars.
We present new data on isotopologue lines of a well-selected sample
of AGB stars, covering the three spectral classes of C-, S- and M-type
stars. We report on the first efforts made in determining accurate
isotopologue fractions, focusing on oxygen isotopes which are a crucial
tracer of the poorly constrained extra mixing processes in stellar
atmospheres. |
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