Context.Element diffusion is expected to occur in all kinds of stars: according to the relative effect of gravitation and radiative acceleration, they can fall or be pushed up in the atmospheres. Helium sinks in all cases, thereby creating a gradient at the bottom of the convective zones. This can have important consequences for the sound velocity, as has been proved in the sun with helioseismology.
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Castro et al. (2006) studied this question.
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