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March 6, 2015

March 6, 2015

Posted by **nichola** on Thursday, July 9, 2009 at 3:44pm.

Assuming L/Lv is the same for both stars find the ratio ofthe radii of A and B.

I have the equation R/R= (L/L)^1/2(T/T)^2.

I can do this for each star in terms of solar masses but i am unsure which temperature goes in the numerator/denominator?

Is (L/Lv)^1/2 sqr root 20?

- Astronomy -
**bobpursley**, Thursday, July 9, 2009 at 5:14pmluminosity is proportional to r^2*temp^4

so if are comparing r, then

r^2 prop Luminosity/T^4

so in your

Ra/Rb= sqrtLa/Lb) * (tb/ta)^2

= sqrt (20) * (4850/7150)^2

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