What is a Cepheid variable star and what makes it variable?

Answer 1

A cepheid variable star is a pulsating variable star. It is a variable star because its brightness varies from time to time.

Recall that Cepheid variables are unique among variable stars in that they exhibit changes in size and brightness.

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Answer 2

Alexander Acosta

A Cepheid variable star is a kind of giant or supergiant star that pulsates radially, varying in brightness with a well-defined stable period and amplitude. The star's intrinsic luminosity is directly related to the period of variability, which is caused by periodic changes in the star's temperature and radius, which in turn affects its luminosity. The star's luminosity is affected by the balance between pressure pushing outward and gravity pulling inward.

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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.