[mesa-users] advice for massaging a model

[Bill Paxton]

Hi Guy,

In some cases with pre-main sequence models, you can get around the problem 
by waiting until a bit later in the evolution before making the changes.
For example, don't change the element mix until the star has dropped well
down the Hayashi track -- check to see where it first develops a radiative core,
and then save a model a few 10's of steps before that when it is still fully
convective.   Then with that saved model, start a new run and change the
element mix at that point.  Since the star will still be fully convective, the
changes to the composition will get mixed in okay.  And since you won't have
started any burning, that will be okay too.   Since most of the pre-ms contraction
is over, you will avoid some of the convergence issues that go along with that.

Let me know if that works for you!

-Bill


 


On Apr 4, 2012, at 9:36 AM, Guy Worthey wrote:

> Dear Musers,
> 
> I happened to add some carbon to the element mix and the  0.1 Mo star
> promptly got stuck halfway down the Hayashi track due to a failure to
> converge (other masses were fine). I therefore want to take that
> failed model and massage or smooth or compress or something to get a
> star that will make it to the main sequence.
> 
> My plea for advice is, since I don't know MESA very well, what are the
> ways that people do tweak-and-restarts on their hard-to-converge
> models? I'm sure this problem has come up for people a few tens of
> thousands of times in the past.
> 
> Thanks so much,
> Guy
> 
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