[Mesa-users] Evolving star in user-specified medium

[Francis Timmes]

hi roseanne,

one option might be to change the outer boundary conditions to be the user-specified medium. 
examples of modifying the outer boundary condition include star/test_suite/conductive_flame 
(used in https://ui.adsabs.harvard.edu/abs/2020ApJ...891....5S/abstract), 
and https://doi.org/10.5281/zenodo.4437705 
(used in https://ui.adsabs.harvard.edu/abs/2021ApJ...910...94C/abstract).

fxt



> On Jan 19, 2023, at 12:01 PM, Cheng, Roseanne Marie via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Hi everyone,
> 
> Thank you so much again for answering our questions!  We were wondering if it is possible evolve a star (such as with make_zams) in a user-specified medium.  In looking at the atmosphere controls, choices can be made at the boundary conditions.  We would like to evolve the system with a domain that extends past the surface of the star by several radii to include a user-specified medium which could be consistent with the current atmosphere BCs.  Is this possible?  Is there a test we could look at to create an artificial "envelope" or medium around the star?
> 
> Thanks,
> Roseanne 
> 
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