The pulsation in the luminosity of variable stars is driven by the changing opacity of their atmosphere.

Name: The pulsation in the luminosity of variable stars is driven by the changing opacity of their atmosphere.
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Quizplus · Accepted Answer

The pulsation in the luminosity of variable stars, such as Cepheid variables, is indeed driven by changes in opacity in their atmospheres, primarily due to the ionization of helium which affects the star's ability to trap and release energy.

The Pulsation in the Luminosity of Variable Stars Is Driven