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Radial and Nonradial Oscillations in Delta Scuti Stars

Published online by Cambridge University Press:  12 April 2016

D. W. Kurtz
D. W. Kurtz*
Affiliation:
Department of Astronomy, University of Cape Town

Extract

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Mode identifications from the phase shift between the B-V color curves and the V light curves of Delta Scuti stars are discussed. For five Delta Scuti stars the frequency of highest amplitude is due to pulsation in a radial mode with one or more frequencies due to nonradial modes lying nearby. Thus there may be a resonance between the frequencies of radial and nonradial modes. This behavior has only been found in subgiant and giant stars so far, but this could easily be a selection effect. Theoretical predictions of frequencies for different 1-modes of the same overtone for main sequence, subgiant, and giant stars are needed to compare with these observations. Theoretical predictions of the strength of resonance coupling between radial and nonradial modes as a function of frequency separation are also needed.

Type
IV. δ Scuti and Dwarf Cepheid Variables
Information
International Astronomical Union Colloquium , Volume 58: Stellar Hydrodynamics , August 1980 , pp. 377 - 380
Copyright
Copyright © Reidel 1980

References

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