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arxiv: astro-ph/0504495 · v1 · submitted 2005-04-22 · 🌌 astro-ph

On the excitation of PG1159-type pulsations

classification 🌌 astro-ph
keywords 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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