Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306l..41k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 306, July 1, 1986, p. L41-L44. Research sponsored b
Astronomy and Astrophysics
Astrophysics
25
Helium Hydrogen Atmospheres, Magnetohydrodynamic Stability, Planetary Nebulae, Stellar Oscillations, Nuclear Fusion, Stellar Evolution, White Dwarf Stars
Scientific paper
Preliminary results of fully nonadiabatic g-mode pulsation calculations for evolutionary models of hydrogen-deficient planetary nebula nuclei (PNNs) with active helium-burning shells are reported. Instabilities are found that are driven by the epsilon-mechanism at the position of the helium-burning shell. The periods of the unstable modes range from 50 to 214 s. In all models, the presence of an active nuclear burning shell demands that some g-modes are unstable. It is suggested that if hydrogen-deficient PNNs contain helium-burning shells, then they should show such pulsations.
Hansen Camilla Juul
Iben Icko Jr.
Kawaler Stephen D.
Winget Don E.
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