Why do cepheid stars pulsate?

Answer 1

Hot areas in the star produces #He^+#, even hotter areas produce #He^(2+)#.
#He^(2+)# absorbs more light than #He^+# and so absorbs more heat too.
It heats up, expands, cools and repeats.

See the video explanation at Khans Academy by clicking this link;

Why do Cepheids Pulsate? https://tutor.hix.ai

Go to 0:53.

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Answer 2

Claire Anctil

Cepheid stars are useful for astronomical distance measurements because of their pulsation, which is caused by periodic variations in their internal temperature and density brought on by the balance between radiation pressure and gravitational forces. The pulsation is related to the star's outer layers contracting and expanding, resulting in a variation in brightness.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.