The early post-AGB instability produces HRD loops and photospheric 7Be enhancement but does not significantly alter the final white dwarf hydrogen envelope mass.
On an Early - Post-AGB Instability
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abstract
Dynamical stellar-evolution modeling through the AGB phase reveals that radial pulsations with very fast-growing amplitudes develop if the luminosity to mass ratio of stars with tenuous envelopes exceeds a critical limit. An instability going nonlinear already after a few pulsation cycles might qualify as a source of the superwind - postulated to shed a substantial part of a star's envelope over a very short time - of hitherto persistently mysterious nature.
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Early Post Asymptotic Giant Branch Instability: Does it Affect White Dwarf Hydrogen Envelope Mass?
The early post-AGB instability produces HRD loops and photospheric 7Be enhancement but does not significantly alter the final white dwarf hydrogen envelope mass.