δ Scuti variables: The link between giant- and dwarf-type pulsators

  • W. Dziembowski
1. δ Scuti Stars
Part of the Lecture Notes in Physics book series (LNP, volume 125)


An attempt is made to interpret the differences in pulsational behavior between horizontal branch and main sequence (or early post-main sequence) variables. Results of linear stability studies for d Scuti stars are reviewed and supplemented with new calculations. The function of the opacity mechanism in generating instability to a variety of radial and nonradial modes is discussed. The highest excitation rates for these variables, though still much lower than in the case of Cepheids, are found in fundamental modes with higher spherical harmonic orders, ℓ and among higher overtones with low values of ℓ It is argued that amplitudes in δ Scuti stars are limited by nonlinear mode coupling, resulting in lower amplitudes and multiperiodicity, rather than by saturation of the opacity mechanism as is the case with horizontal branch variables.


Radial Mode Propagation Zone Main Sequence Star Ionization Zone Instability Strip 
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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • W. Dziembowski
    • 1
  1. 1.Department of PhysicsUniversity of ArizonaTucson

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