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Variable stars - luminosity v period

doctoremma · 2012-06-27 13:43:59

Me again, you will get sick of it. Why is there a link between the period of a variable star and its luminosity, such that you can calculate luminosity based on period? I understand how luminosity varies as the star size changes. Is it impossible to have two stars with the same period but with different luminosities? Why?…

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27-06-2012 2:43pm

#1

doctoremma

Registered Users Posts: 1,870 ✭✭✭

Join Date: October 2009

Posts: 1849

Me again, you will get sick of it.

Why is there a link between the period of a variable star and its luminosity, such that you can calculate luminosity based on period?

I understand how luminosity varies as the star size changes. Is it impossible to have two stars with the same period but with different luminosities? Why? Is there only a single set of star conditions that can lead to a single period, thus the luminosity MUST be the same?

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