Observed helium glitch amplitudes in three F stars require an envelope mixed mass of about 5e-4 solar masses, far larger than the roughly 1e-6 inferred from heavy element abundances.
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Helium settling in F stars: constraining turbulent mixing using observed helium glitch signature
Observed helium glitch amplitudes in three F stars require an envelope mixed mass of about 5e-4 solar masses, far larger than the roughly 1e-6 inferred from heavy element abundances.