Analogy of rapid oscillations of AP stars to solar oscillations

Astronomy and Astrophysics – Astronomy

Scientific paper

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A Stars, Magnetic Stars, Peculiar Stars, Solar Oscillations, Stellar Oscillations, Variable Stars, Frequency Distribution, Harmonic Oscillation, Radial Velocity

Scientific paper

It is shown that the rapid oscillations of Ap stars discovered by Kurtz can be interpreted as a superposition of high overtone p-mode oscillations (n ≅ 40) with low spherical harmonic index l (l = 0, 1, 2), quite similar to the solar oscillations. A fine structure of triplets in the amplitude spectrum is evidence of the existence of dipole (l = 1) modes, while a slight, systematic departure from equal spacing of frequencies gives a strong indication for radial (l = 0) modes.

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