Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..220k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 220-228.
Astronomy and Astrophysics
Astrophysics
34
Astronomical Models, Hydrogen, Planetary Nebulae, Stellar Oscillations, Gravity Waves, Nitrogen Isotopes, Oxygen Isotopes, Stellar Interiors
Scientific paper
The author reports results of fully nonadiabatic g-mode pulsation calculations for evolutionary models of planetary nebula nuclei (PNNs) with active hydrogen-burning shells. The author finds g-mode instabilities that are driven by the ɛ-mechanism at the position of the nuclear burning shells in stadard PNN models. In all hot high-gravity models, the presence of an active nuclear burning shell demands that some g-modes are unstable; if hot high-gravity PNNs contain hydrogen-burning shells, then they should show such pusations. The absence of observed pulsations suggests that the central stars do not retain enough hydrogen to support nuclear burning following ejection of the planetary nebula.
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