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On an Early - Post-AGB Instability

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arxiv 2303.11374 v1 pith:ECEPCIUX submitted 2023-03-20 astro-ph.SR

classification astro-ph.SR
keywords instabilityveryalreadyamplitudescriticalcyclesdevelopdynamical
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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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  1. Early Post Asymptotic Giant Branch Instability: Does it Affect White Dwarf Hydrogen Envelope Mass?

    astro-ph.SR 2025-05 conditional novelty 5.0 of 10

    The early post-AGB instability produces HRD loops and photospheric 7Be enhancement but does not significantly alter the final white dwarf hydrogen envelope mass.

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