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Lecture18OriginsofElements-2_001

Lecture18OriginsofElements-2_001 - L Lecture 18 Origin of...

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L H Lecture 18 Hertzsp 8: Origin o rung Ru of the Elem ussell D ments 2 iagram
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Temperature, size and luminosity We know that for objects that are approximately blackbodies Hotter things are brighter. o Energy radiated per unit time per unit area is proportional to T 4 , o so bigger T means more energy radiated Bigger things are brighter. o Energy radiated per unit time per unit area is proportional to T 4 , o so bigger surface area means more energy radiated. Putting this together, we have [Taken from http://zebu.uoregon.edu/~soper/Stars/hrdiagram.html ]
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