Analytic solutions of the radial pulsation equation for rotating and magnetic star models

Statistics – Applications

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Magnetic Stars, Stellar Models, Stellar Oscillations, Stellar Rotation, Wave Equations, Adiabatic Equations, Cepheid Variables, Nonadiabatic Conditions, Perturbation Theory, Radial Distribution, Stellar Magnetic Fields, Systems Stability

Scientific paper

Eddington's (1926) form of wave equation for small-amplitude, radial, adiabatic stellar pulsations of spherically symmetric, gaseous stars is generalized to include the effects of axial rotation and tangled magnetic fields. Equilibrium quantities possessing dimensions are affected, and the relative importance of rotation and magnetism in affecting pulsation characteristics of the models depends on the choices of gamma and the type of model. Solutions are obtained in closed form for adiabatic pulsation periods of fine analytic stellar models, and nonadiabatic stability criteria are determined by means of the one-zone stellar model. Results are discussed for a range of physical parameters such as rotational angular momenta, central condensations, and magnetic energies; and applications are made to the case of classical Cepheids and other variable giant stars.

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