[mesa-users] Enabling diffusion in Mesa-r8118

Evan Bauer ebauer at physics.ucsb.edu
Sat May 21 17:10:47 EDT 2016

Hi Hector,


In a sense, ne22 diffusion is easy to “turn on” in MESA. Just make ne22 its own diffusion class and you will certainly see it sink toward the center of a MESA model.


However, I suspect that’s not quite what you’re asking. Some of the most important physics of ne22 sedimentation is not yet part of the code. E.g. the energy released by ne22 sedimentation (http://adsabs.harvard.edu/abs/2001ApJ...549L.219B) has not yet been implemented, though we may be updating that soon. We’re also still considering what to do for the diffusion coefficients in the liquid regime.


Does that answer your question?





From: Héctor MR [mailto:hector.mr at pitt.edu] 
Sent: Friday, May 20, 2016 3:05 PM
To: Evan Bauer
Cc: MESA users group
Subject: Re: [mesa-users] Enabling diffusion in Mesa-r8118


  Hi Evan,

  Given this email thread, I wanted to take the opportunity to ask you about the sedimentation of ne22 in WDs with MESA. As far as I know, it has not been fully implemented in the code, right? Regardless of the control 

  diffusion_use_cgs_solver = .true.

  you mention (which would help in WDs anyway).




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