[mesa-users] Problem evolving a donor star

[Odette Toloza]

Hola Pablo,

Thanks for helping me.

I've installed the latest version, 7184. Maybe having a look into the time
step could handle it, I mean constraining the maximun value. I do not know.

Find attached the files.


Cheers,
Odette.


2014-12-10 17:11 GMT+00:00 Pablo Marchant <pamarca at gmail.com>:

> Hola Odette!
>
> Usually that error message appears when angular momentum comes out
> negative. That can happen since we compute delta J = jdot*dt (just the
> Euler method). However it usually means something else is wrong. Could you
> provide me with your full set of inlists and saved models (together with
> your MESA version) to check wether this is a bug?
>
> Cheers!
>
> On Wed, Dec 10, 2014 at 5:47 PM, Odette Toloza <odette.toloza at gmail.com>
> wrote:
>
>> Hi Mesa-users
>>
>> I am relatively new with MESA, and I am having troubles with evolving a
>> binary system containing a evolved donor. Based on the
>> binary_donor_only_implicit_mdot suite test we have tried to evolve white
>> dwarf of 0.8 solar masses together with a donor star of 1 solar mass. But
>> first at all we created a model for the donor starting from the ZAMS and
>> stopping the evolution controlling the core composition.
>>
>>
>> xa_central_lower_limit_species(1) = 'h1'
>> xa_central_lower_limit(1) = 0.5  ! or less evolved 0.8
>>
>>
>> When we include this model on the binary_donor_only_implicit_mdot suite
>> test and we make sure that with an orbital period of 0.6d the system is out
>> of contact. It starts running but as soon as the mass transfer starts MESA
>> stops. The first amount of mass transferred is too high and MESA collapses
>> returning negatives values for angular momentum (STOP bad
>> angular_momentum_j).
>>
>> the orbit shrinks quite fast since the jump of (r-rl)/rl is too abrupt
>> before the last step is 6.421261633E-01 and in the last step is
>> -1.409570580E-02, as well as lg_mdot, from -2.062847169E+01 to
>> -9.900000000E+01
>>
>> We have considered all the mechanisms of jdot,
>>
>>    do_jdot_gr = .true.
>>    do_jdot_ml = .true.
>>    do_jdot_ls = .true.
>>    do_jdot_missing_wind = .true.
>>    do_jdot_mb = .true.
>>
>>
>>
>> For some reason MESA complains with the inclusion of an evolved donor. To
>> make sure that we are not making any mistake during the inclusion of the
>> model, we created another evolved model this time with 80% of hydrogen in
>> the core. When we include it, MESA runs without problems.
>>
>>
>> Does anyone have any idea why this could be happen?
>>
>> Cheers,
>> Odette Toloza
>>
>>
>>
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>>
>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD student, Argelander-Institut für Astronomie
>
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