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

[Rob Farmer]

Hi,

Saving a model for each star in a binary is the same as when doing single
stars
https://docs.mesastar.org/en/r15140/reference/star_job.html#save-model-filename
You just have to set it up for both stars in their star_job inlists and
pick an appropriate exit condition.

Rob

On Tue, 19 Oct 2021 at 14:39, AbdelBassit Senhadji <sen-abd at hotmail.fr>
wrote:

> Hi Rob!
>
> Thanks for your suggestions. Yes for the relax routines did not work and
> just stopped few models after it was saying " "Maximum retries reached"
>
>
> I was restarting my runs from photos, I think this is a mistake from you
> are saying. How to save a model file for both binaries? Any documentation
> available on the MESA sourceforge?
>
> Thanks
> Abdel
>
>
>
> ------------------------------
> *From:* Rob Farmer <robert.j.farmer37 at gmail.com>
> *Sent:* Tuesday, October 19, 2021 5:48:01 AM
> *To:* AbdelBassit Senhadji <sen-abd at hotmail.fr>
> *Cc:* mesa-users at lists.mesastar.org <mesa-users at lists.mesastar.org>
> *Subject:* Re: [Mesa-users] Problem with a Mass loss from a binary
>
> 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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