Abstract
Giants have large radii and large surface convection zones. Below the surface convection zone, gravity, radiative accelerations, and concentration gradients increase considerably as one approaches the hydrogen burning shell and the core. These are conditions where atomic diffusion can play a role. Furthermore, giants hold the imprint of diffusion having occurred throughout the preceding evolution. It is shown at what accuracy level atomic diffusion may be safely neglected on the red giant branch by considering successively its effect on the properties of the hook, on potential mixing ahead of the burning shell, and on the mass of the resulting core after the helium flash.
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- 2.
The drift velocity is the diffusion velocity without the contribution of the concentration gradient term.
- 3.
See § 6 of Michaud et al. (2010) for more details.
- 4.
From data used by Michaud et al. (2010) where more details may be found; see in particular their Fig. 8.
- 5.
- 6.
- 7.
See Fig. 3 of Michaud et al. (2010).
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Michaud, G., Alecian, G., Richer, J. (2015). Giants. In: Atomic Diffusion in Stars. Astronomy and Astrophysics Library. Springer, Cham. https://doi.org/10.1007/978-3-319-19854-5_11
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DOI: https://doi.org/10.1007/978-3-319-19854-5_11
Publisher Name: Springer, Cham
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