[mesa-users] neutral H in giants' envelope

Jing Luan jingluan at caltech.edu
Fri Aug 12 00:44:38 EDT 2011


There is a parameter called lnfree_e ( please check 
star/public/star_data.dek) indicating the free electron number per 
nucleon. You can refer it as s% lnfree_e. You could then use Saha's 
equation, together with the temperature s% T to get the ionization 
fraction of H. I do not know that there is a direct H ionization 
fraction parameter though.

Hope it helps :-)


On 8/11/11 9:24 PM, Jean-Claude Passy wrote:
> Hi mesa-users,
> I have a stellar structure of a giant star and I would like to know how
> much of the envelope is already neutral H. How could I get this
> information ?
> Any help would be greatly appreciated.
> Thanks a lot,
> JC
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Ph.D candidate at physics.caltech
email: jingluan at caltech.edu
address: MC350-17,Caltech,1200 E.California Blvd
          Pasadena, CA 91125

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