[mesa-users] Mass transfer lag in binary

François Dufour dufourf at physics.mcgill.ca
Wed Nov 20 11:03:28 EST 2013


Thanks. It looks like the mass transfer fraction is offset as well.


On Wed, Nov 20, 2013 at 10:23 AM, Pablo Marchant <pamarca at gmail.com> wrote:

> Hi François. I can confirm this, though it is only a problem in output. Both
> binary donor test suites evolve conservatively.
>
> This is not so much lg_mstar_dot_1 lagging by a timestep, but rather
> lg_mstar_dot_2 stepping ahead a single timestep. Since it is only an output
> problem, it does not affect the results, the system is evolving as it
> should. This happens only when using the explicit scheme, you see it in
> binary_donor_only_implicit because the implicit scheme is only used when
> the explicit value of mdot is above a threshold, otherwise it is too
> expensive (and you can see the two values get in sync when the implicit
> scheme stars working).
>
> This is a simple bug, and I'll get it fixed for next release, Cheers!
>
>
> On Wed, Nov 20, 2013 at 2:44 PM, François Dufour <
> dufourf at physics.mcgill.ca> wrote:
>
>>
>> While running the binary_donor_only test suite under version 5596,
>> unmodified except for stopping_age = 1d10, it appears that there is a lag
>> in the mass loss. Examination of the binary_history.data
>> columns lg_mstar_dot_1 and lg_mstar_dot_2 shows that lg_mstar_dot_1 lags by
>> one step, consistently.
>>
>> I have seen the same problem in binary_donor_only_implicit_mdot and for
>> various binary parameters as well. I'm guessing that this might be a bug?
>>
>> --
>> Francois Dufour
>> McGill University
>> Ph.D Student, Physics
>>
>>
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>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD student, Argelander-Institut für Astronomie
>



-- 
Francois Dufour
McGill University
Ph.D Student, Physics
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