[Mesa-users] the number density of free electrons in the core

[Francis Timmes]

ye is the electron to baryon ratio and a profile output option:

ye = n_e / n_b 

where n_e is the number density of free electrons and n_b is the number density of baryons.

rho is the baryon mass density and a profile output option:

rho = n_b / N_A

where N_A is the avogadro number. hence,

n_e = ye * n_b = ye * rho * N_A

which one can form by post-processing a profile file or by doing the multiplication
in a run_star_extras and output it as an extra column.

probably full ionization is assumed for the reported ye, but i haven't looked.

fxt


 


> On Mar 14, 2019, at 12:33 AM, Poojan Agrawal via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Dear all,
> 
> I looking for a way to output the number density of free electrons in the core of a star.
> 
> I am unable to find any option for it in either history or profile defaults. Neither, I am able to locate the variable name so that I can output it by adding an extra column in run_star_extras?
> Can you help me with it?
> 
> Thanks,
> Poojan Agrawal
>  
> PhD Candidate
> Centre for Astrophysics and Supercomputing
> Swinburne University of Technology
> Melbourne
>  
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