Nonlinear δ Scuti models: The main sequence catastrophe?

  • R. F. Stellingwerf
1. ° Scuti Stars
Part of the Lecture Notes in Physics book series (LNP, volume 125)


For nonlinear models of 0.4 M and 2.0 M δ Scuti stars, pulsation amplitudes obtained in this region depend critically upon artificial viscosity parameters. Models with limited viscosity attain huge amplitudes. Furthermore, it is found that nonlinear stability properties depend primarily upon the amplitude. Determination of the actual dissipation mechanism is thus crucial to our understanding of these objects, and probably other main sequence pulsators as well. At present the most likely mechanisms appear to be 1) dissipation in the atmosphere, corona and wind; 2) turbulent dissipation in the convective zones; 3) magnetic fields.


Convective Zone Globular Cluster Turbulent Dissipation Viscosity Parameter Limited Viscosity 
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  3. Stellingwerf, R.F. 1979, Ap. J., 227, 935.Google Scholar

Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • R. F. Stellingwerf
    • 1
  1. 1.Department of Physics and AstronomyRutgers UniversityNew BrunswickNew Jersey

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