Astrophysics
[Submitted on 22 Apr 2005]
Title:On the excitation of PG1159-type pulsations
View PDFAbstract: 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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