An Etymological Dictionary of Astronomy and Astrophysics
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A chemically peculiar star characterized by the presence of high-frequency non-radial oscillations, with periods that range between about 4 and 16 min. These variations have periods from about 5 to 20 minutes and low amplitudes (B < 10 mmag). They are consistent with acoustic (→ p mode) pulsations of low degree and high radial overtone.

→ rapid; → -ly; → oscillate; → -ing; → Ap star.