Consider a Cepheid variable with a period of ten days, a mean radius of about 100 solar R, and a radial velocity averaging 15km/s. What is the change in its radius delta R?
Thanks for your help, I'm a bit stumped!|||Check out
http://www.astro.sunysb.edu/fwalter/PHY5鈥?/a>
scroll down to Theory of the Cepheid Period-Luminosity Relation
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