[mesa-users] mesa release to synch with new MESA SDK release

[Bill Paxton]

Hi,

This new mesa version (4849) has the few small changes to makefile_header required to make it work with the new MESA SDK.

There is also a fix provided by Josiah Schwab to allow relax composition to work from an arbitrary starting model number rather than only from model number 1.

We've added control parameters to set lower limits for rotational distortion corrections factors FP and FT.  The old hard-wired limits were 0.6 for each; now the defaults are higher (corresponding to less geometric distortion):
         
            FP_min = 0.75
            FT_min = 0.95

I'm working on element diffusion using the beautiful work of Haili Hu and collaborators as a guide.   
Hopefully this will let us support radiative levitation in a future release, but we already have
an option to use atomic diffusion coefficients according to Paquette et al. (1986) instead of
assuming pure Coulomb.   The default is still to use pure Coulomb, but you can try using
the Paquette coeffs by setting diffusion_use_pure_Coulomb = .false.

For a preview of where we are headed with element  diffusion, take a look at this 2011 paper 

  Haili Hu, C. A. Tout, E. Glebbeek and M.-A. Dupret,
  "Slowing down atomic diffusion in subdwarf B stars: mass loss or turbulence?",
  Mon. Not. R. Astron. Soc. 418, 195–205 (2011)

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Cheers,
Bill