[mesa-users] v_flag

[Robert Farmer]

Hi

> v_flag is one that I am confused about. I do not understand what it does,
nor can I find an explanation of it in either
> the star_job.defaults, or this mailing list. Can anybody provide me with
a physical explanation as to what it does?

The v_flag adds an additional equation to mesa to evolve, so that you can
model the radial velocity of material (say when a star is collapsing )

http://mesa.sourceforge.net/star_job_defaults.html#velocity_variables


> And while I have your (collective) brains to pick, I am also surprised at
the choice of overshoot parameters in this
> inlist. Specifically, the choice of 0.001 for non_burn and h which is
below the recommended value in the MESA
> paper on massive stars, and 0 for he and z.

The test suite should be considered good places to start a problem from,
but do not define a "recommended" set of values. A better way to think
about them is they define the options you should probably be considering
when evolving a star  but not necessarily with those values.

Rob


On Thu, May 12, 2016 at 1:23 PM, Yevgeni Kissin <kissin at astro.utoronto.ca>
wrote:

> Dear MESA community,
>
> I am currently working on massive star evolution and am basing my model on
> the 'inlist_massive_defaults' file, in
> version 7503. There are plenty of flags explicitly included in this
> inlist, some of which are simply set to the default.
> But ignoring these, I am attempting to reduce the flags set to non-default
> values, by understanding what each
> represents.
>
> v_flag is one that I am confused about. I do not understand what it does,
> nor can I find an explanation of it in either
> the star_job.defaults, or this mailing list. Can anybody provide me with a
> physical explanation as to what it does?
>
> And while I have your (collective) brains to pick, I am also surprised at
> the choice of overshoot parameters in this
> inlist. Specifically, the choice of 0.001 for non_burn and h which is
> below the recommended value in the MESA
> paper on massive stars, and 0 for he and z.
>
> Thank you very much,
>
> Yevgeni Kissin
> PhD Candidate
> Canadian Institute for Theoretical Astrophysics
> University of Toronto
>
>
>
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