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What scientific method is used to observe the pulsation in size of a Cepheid variable star?

doit_the_clown

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What scientific method is used to observe the pulsation in size of a Cepheid variable star?

What scientific method is used to observe the pulsation in size of a Cepheid variable star?
A)   This behavior has only been predicted theoretically and has never been detected.
B)   The observed perturbations in the orbits of planets around these stars
C)   The observed increase and decrease in the size of the star's image
D)   Doppler shift of absorption lines in its spectrum

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Discovering the Universe

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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