[mesa-users] Mass Transfer + Rotation Problems

[Pablo Marchant]

Ok, saved a model of the accretor for the binary run, just before mass
transfer, to experiment with it with single star mesa.

Attached is the model star with the inlist I'm using to test it. For
mass_change = 1d-5 the model has problems converging and ends up with very
small timesteps right away. Slightly smaller mass_change can cause the
model to behave at the first timesteps, but end up in the same situation.

Just to note, this also seems to happen with mass loss, though things start
getting messy at around mass_change = -1d-4.

The value 1d-5 is actually around the same value that the implicit scheme
attempts before ending up with tiny timesteps, and it's not very high, I
would actually expect it to rise significantly more than that.

I'm certainly interested in digging into the mass adjustment routines and
how it deals with angular momentum, as I'm starting to check how to
implement the missing features regarding rotation into binary MESA.

Cheers!


On Fri, Mar 1, 2013 at 6:38 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi Pablo,
>
> On Mar 1, 2013, at 5:53 AM, Pablo Marchant wrote:
>
> > Will try to see if I can get something similar experimenting with single
> rotating stars to check if this is effectively not a problem with the rlo
> routines.
>
> Thanks for looking into this.
> If it turns out not to depend on the rlo routines, feel free to punt it
> back to me.
> But if you'd like to dig into the details of the interactions of rotation
> and
> mass transfer, I'd be delighted.  ;-)
>
> It is quite possible that this is the first case of accreting onto a
> rotating model.
> The case of mass loss with rotation has been run alot, but not mass gain.
>
> Cheers,
> Bill
>
>


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