Is extra mixing really needed in asymptotic giant branch stars?
We demonstrate that the amount of extra mixing required to fit the observed low C/N and12C/13C ratios in first giant branch (FGB) stars is also sufficient to explain the carbon and nitrogen abundances of Galactic asymptotic/second giant branch (AGB) stars. We simulate the effect of extra mixing on the FGB by setting the composition of the envelope to that observed in low-mass (M ≤ 2 M) FGB stars, and then evolve the models to the tip of the AGB. The inclusion of FGB extra mixing compositional...[Show more]
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|Source:||Astrophysical Journal, The|
|01_Karakas_Is_extra_mixing_really_needed_2010.pdf||382.1 kB||Adobe PDF||Request a copy|
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