The restoring force to create the contraction phase of a pulsation can be pressure if the pulsation occurs in a non-degenerate layer deep inside a star, and this is called an acoustic or pressure mode of pulsation, abbreviated to p-mode.
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HD 49976, also known as V592 Monocerotis, is a variable star in the constellation of Monoceros (the Unicorn).
V337 Carinae, also designated q Carinae, a variable star in the constellation Carina