On the rapid variability of central stars of planetary nebulae

Details On the rapid variability of central stars of planetary nebulae On the rapid variability of central stars of planetary nebulae

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..791s&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, May 1, 1977, p. 791-793.

Astronomy and Astrophysics

Astrophysics

4

Early Stars, Planetary Nebulae, Stellar Envelopes, Stellar Models, Variable Stars, Carbon, Hertzsprung-Russell Diagram, Hot Stars, Nitrogen, Oxygen, Stellar Luminosity

Scientific paper

Envelope models for central stars of planetary nebulae have been constructed with Carson's (1976) radiative opacities. A stability analysis of these envelopes indicates that for a sufficiently high luminosity, the fundamental mode of radial pulsation is excited by the kappa mechanism operating in the CNO ionization zone. At somewhat higher luminosities the lowest overtones also become unstable. This may possibly explain the rapid variability that is observed in some central stars, if the time scale of the variations is minutes to hours.

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