[Mesa-users] binary

[Rob Farmer]

Hi,

> 1- Is there any limit in the initial eccentricity and separation of the
binary that one can assume? Since this is 1D, I am guessing that there must
be a limit for this. If I choose the initial separation to be 10Rsun and
ecc = 0.9999 I am guessing that I will be running into a snag.

In the binary_controls.defaults there is the control max_eccentricity which
defaults to 0.99. You could try changing that and see what happens. Even
with e=0 we do stop if you have RLOF at formation, so i except with a
sufficiently large e value you'll always stop due to RLOF at model number
0. This is controlled by the terminate_if_initial_overflow flag.

> 2- How can I plot the light curve? And the power, eccentricity evolution,
semi-major axis?

As long as you have append_to_star_history = .true. in your binary controls
then all binary output is available in pgstar. So you can make a pgstar
plot that shows these quantities.

> 3- How can I tell gyre to only analyse one of the two stars taking part
in the collision?

If you're running gyre in MESA, then you could modify your run_star_extras
and check the star_id is for the star you want.
If you're running gyre in a post-processing step then you could have just
write_pulse_data_with_profile = .true. in one of your stars inlists to
output the pulsation inputs for only one star

Rob


On Tue, 18 Oct 2022 at 21:02, Mare Dedeu via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear all,
>
> I am doing a few experiments with mesa/binary and I have a few questions.
> I would appreciate any input. I am relatively new to mesa.
>
> 1- Is there any limit in the initial eccentricity and separation of the
> binary that one can assume? Since this is 1D, I am guessing that there must
> be a limit for this. If I choose the initial separation to be 10Rsun and
> ecc = 0.9999 I am guessing that I will be running into a snag.
>
> 2- How can I plot the light curve? And the power, eccentricity evolution,
> semi-major axis?
>
> 3- How can I tell gyre to only analyse one of the two stars taking part in
> the collision?
>
> Thanks and apologies for the ignorance!
>
> Pau
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>
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