Overtures to the pulsational instability of ZZ Ceti variables

Details Overtures to the pulsational instability of ZZ Ceti variables Overtures to the pulsational instability of ZZ Ceti variables

1995-07-26

arxiv.org/abs/astro-ph/9508002v1

Astronomy and Astrophysics

Astrophysics

13 pages, postscript figures included in text, uuencoded gzipped ps-file. Submitted for publication in Astron.&Astrophys

Scientific paper

Results of nonradial, nonadiabatic pulsation calculations on hydrogen-rich white dwarf models are presented. In contrast to earlier attempts, the modeling builds on hydrodynamically simulated convective surface layers supplemented with standard interior models. Based on our stellar models and despite of various simple attempts to couple convection and pulsation we could not reproduce theoretically the presently adopted location of the observed blue edge of the ZZ Ceti variables. When the convective efficiency is high enough we found a sensitive dependence of the stability properties of the g-modes on the pulsational treatment of shear within the convection zone.

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