Lecture 24: AGB Stars and Massive Star Evolution
Lecture 24: AGB Stars and Massive Star Evolution
Lecture 24: AGB Stars and Massive Star Evolution
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Semi-Convection<br />
Opacity per mass higher for Hydrogen then Helium<br />
(more electrons per mass)<br />
Imagine core of 40% Helium surrounded by an<br />
envelope layer of mostly 10% Helium. High<br />
opacity leads to convection, which mixes Helium<br />
into envelope, lowering opacity.<br />
Thus, such regions may have slow convection just<br />
to keep material mixed.<br />
Sunday, May 1, 2011
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