[Mesa-users] Problem with a Mass loss from a binary

[Rob Farmer]

Hi,

Yes you can stop the model, save a model file for each star (not a photo),
then rerun mesa and load those models back in but with a new initial
period. I use this when I want to ignore the companion (by putting the
period at 1d8 days). The other option is just to save a model then load it
in a star work directory rather than a binary work directory (so you do one
star at a time without a companion).

To take mass off at a constant rate, in the controls inlist for each star
you can set mass_change to a chosen Mdot or use one of the relax routines
to remove mass. It's not clear from your question whether this worked? or
there was an error? Or something else occurred?

Rob


On Mon, 18 Oct 2021 at 15:29, AbdelBassit Senhadji via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi,
>
> I was wondering if we do have in MESA a parameter than can take off the
> mass from a binary on a constant way.
>
> What I am trying to do is to evolve two stars (5.5 for M1 and 3.79 for M2)
> with a period of 3 days. At a certain time the donor will fill it's Roche
> lobe and the period reached 90 days. I am also using mass loss fractions (
> alpha and beta).
>
> I tried to stop at this model and use the last model but with a different
> initial period ( my goal is to let the companion loose it's mass again)
> both stars are in a common envelope and want to take away that ...
>
> Is it correct what I am doing ( I mean restarting the final model with a
> new period)? I also tried to relax both masses, used different wind scheme
> and trigger angular momentum without any success.
>
>
> Any suggestions or help would be very appreciated!
>
>
> Thanks
> Abdel
>
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