Re: [mesa-users] neutral H in giants' envelope

[Jing L. <jin...@ca...>]

Hello,

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 :-)

Sincerely,
Jing

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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-- 
Sincerely
Jing

Ph.D candidate at physics.caltech
email: jin...@ca...
address: MC350-17,Caltech,1200 E.California Blvd
          Pasadena, CA 91125