Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-05-27
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 7 figures, proceeding of 'The Origin of the Elements Heavier than Fe' September 24-28, 2008, Torino, Italy. PASA (acc
Scientific paper
We present computations of nucleosynthesis in red giants and asymptotic giant branch stars of Population I experiencing extended mixing. The assumed physical cause for mass transport is the buoyancy of magnetized structures, according to recent suggestions. The peculiar property of such a mechanism is to allow for both fast and slow mixing phenomena, as required for reproducing the spread in Li abundances displayed by red giants and as discussed in an accompanying paper. We explore here the effects of this kind of mass transport on CNO and intermediatemass nuclei and compare the results with the available evidence from evolved red giants and from the isotopic composition of presolar grains of AGB origin. It is found that a good general accord exists between predictions and measurements; in this framework we also show which type of observational data best constrains the various parameters. We conclude that magnetic buoyancy, allowing for mixing at rather different speeds, can be an interesting scenario to explore for explaining together the abundances of CNO nuclei and of Li.
Busso Maurizio
Guandalini Roald
Maiorca Enrico
Palmerini Sara
No associations
LandOfFree
Nucleosynthesis of light element isotopes in evolved stars experiencing extended mixing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nucleosynthesis of light element isotopes in evolved stars experiencing extended mixing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nucleosynthesis of light element isotopes in evolved stars experiencing extended mixing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-527433