On the excitation of PG1159-type pulsations
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🌌 astro-ph
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starscentralcomparedcomputedcoolingdipoledomaindomains
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Stability properties are presented of dipole and quadrupole nonradial oscillation modes of model stars that experienced a late helium shell flash on their way to the white-dwarf cooling domain. The computed instability domains are compared with the observed hot variable central stars of planetary nebulae and the GW Vir pulsators.
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