How do variable stars pulsate?

Answer 1

The "pulsations" are various forms of energy output variations. They are caused by variations in the size of the star.

Pulsating variable stars are intrinsic variables because the periodic expansion and contraction of their surface layers causes a physical change within the star that accounts for the variation in brightness.

The pulsation periods and light curve shapes of the various types of pulsating variable are determined by the mass and evolutionary stage of a particular star. This implies that the star genuinely experiences periodic increases and decreases in size.

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Answer 2

Nova Adams

Due to internal processes like nuclear fusion reactions and gravitational contraction, variable stars pulsate, causing periodic changes in their size, temperature, and luminosity that are observable from Earth. The pulsations cause the star to expand and contract rhythmically.

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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.