Re: [mesa-users] Entropy Profiles

[Pablo M. <pa...@gm...>]

Then I would expect that your MESA model should be happy to sit forever with
>
>   dL/dM = eps_nuc
>
> and hence Tds/dt = 0.
>

I don't think this is right, this forces the star to be in thermal
equilibrium, and that's not equivalent to evolving at constant entropy. It
will actually force the star to an entropy profile such that T ds/dt=0.
This is quite obvious if you have mass loss on a ZAMS star while fixing its
composition profile and assuming hydrostatic equilibrium. In this case
setting eps_grav=0 will just give you the different entropy profiles for
ZAMS stars of different masses, which are completely different.

In particular, if one is looking for a hydrostatic solution to the
equations of stellar structure, given a fixed composition and entropy
profile, this is completely determined by the mass and pressure equations.
The temperature and luminosity equations will then give you the value of T
ds/dt, which will very likely be non-zero.


> Josiah
>
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-- 
Pablo Marchant Campos
M.Sc on Astrophysics, Universidad Católica de Chile
PhD student, Argelander-Institut für Astronomie