[mesa-users] initial entropy of low-mass stars & planets

[Chris Mankovich]

Hi Ryan,

If you're using create_initial_model to make the initial object, then the
code is guessing an initial entropy (and central pressure) for the starting
isentropic model, and changing it iteratively to find a model matching your
specified mass and radius. Have a look at the code in
star/private/create_initial_model.f.

Chris

On Thursday, November 13, 2014, Ryan Cloutier <cloutier at astro.utoronto.ca>
wrote:

> Hi all.
>
> I've been attempting to vary the initial entropy of a suite of low-mass
> stars and planets by hand. Since there does not exist a single entropy
> parameter that can be varied, I've been playing with the models' physical
> properties such as initial radius, initial mass, initial core temperature,
> etc. I'm wondering if anyone knows exactly how entropy is prescribed. In
> these fully convective models the entropy profile is (mostly) constant but
> I would still like to know the equation used by MESA to compute that
> initial entropy value. That is, what other variables does the entropy
> profile depend on? Any insight would be greatly appreciated.
>
> As an aside in profile_columns.list the (linear) specific entropy profile
> is said to be divided by avo*kerg, where the quantity avo doesn't appear
> to be defined anywhere. Does anyone know what avo is? Obviously this is
> important for analysis with units that are understood.
>
> If it matters I'm using using MESA version 6794.
>
> Thanks a lot!
>
> -Ryan
>
>
> --
> Ryan Cloutier
> Dept. of Astronomy and Astrophysics
> University of Toronto
>
>
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