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Swing Coupling between Stellar Pulsations and Torsional Alfvén Oscillations

Published online by Cambridge University Press:  12 April 2016

T. Zaqarashvili  and
B. Roberts
T. Zaqarashvili
Affiliation:
School of Mathematics and Statistics, University of St. Andrews, St. Andrews, Fife KY16 9SS, Scotland Abastumani Astrophysical Observatory, Al. Kazbegi ave. 2a, 380060 Tbilisi, Georgia
B. Roberts
Affiliation:
School of Mathematics and Statistics, University of St. Andrews, St. Andrews, Fife KY16 9SS, Scotland

Abstract

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We suggest a mechanism of energy transmission from stellar radial pulsations into torsional oscillations in a dipole-like magnetic field. We show that the stellar radial pulsations cause a periodical variation of the Alfén speed which leads to the Mathieu equation for torsional Alfén waves. Harmonics with half the frequency of the pulsations have exponentially growing amplitudes. Then the energy supporting the various type of pulsations can be transformed into purely electromagnetic oscillations of the star.

Type
Part 4. The Interaction between Convection and Pulsation
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 484 - 485
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Gautschy, A. & Saio, H. 1995, ARA&A, 33, 75 Google Scholar
Zaqarashvili, T.V. 2001, ApJ, 552, L81 CrossRefGoogle Scholar