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The symphony of frequencies in some Pulsating Red Giant stars is a bit out of tune. Models with chemical discontinuities due to extra mixing between the convective core and stable radiative layer surrounding it tend to fit these out-of-tune Red Giants.
@MVrard@twitter.com , Cunha, Bossini, @EnricoCors@twitter.com , et al.
https://arxiv.org/abs/2212.11393