[Mesa-users] bad dq error

[Jeremy Sakstein]

Thanks Pablo, I will try this now.

Are there any implications of this? I assume the final relaxed model will
be the same?

Cheers,

Jeremy

On Fri, Jul 10, 2020 at 10:20 AM Pablo Marchant <pamarca at gmail.com> wrote:

> Hi Jeremy,
>
> the algorithm that constructs the initial model can run into that problem.
> One possible workaround is to experiment with this option in star_job
>
>           !### pre_ms_T_c
>           ! Initial center temperature (must be below 1d6).
>           ! If you have initial convergence problems creating a pre-ms
> model,
>           ! you might try different values for `pre_ms_T_c` -- that
> sometimes helps.
>
>        pre_ms_T_c = 3d5
>
> Cheers
>
> On Fri, Jul 10, 2020 at 4:11 PM Jeremy Sakstein <sakstein at hawaii.edu>
> wrote:
>
>> Hi everyone,
>>
>> I have a quick question.
>>
>> This is actually a follow up on my other thread about using other_cgrav
>> with the ppisn test suite. For some range of masses (50-60) I am finding
>> that I get an error message as soon as I begin:
>>
>> create pre-main-sequence model
>>
>>                                           species  mass           8
>>  5.5000000000000007D+01
>>
>>                                                  bad dq          24
>> -1.0081447620088736D-04
>>
>> I ran some tests and it appears that the negative dq is insensitive to
>> the initial mass that I put in.
>>
>> I looked this up in star_utils.f90 and it appears that this error occurs
>> because  there is a cell where dq is negative but I am not sure why this is
>> happening, or what I can do to fix it.
>>
>> Is someone able to point me on the right track?
>>
>> Cheers,
>>
>> Jeremy
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD on Astrophysics, Argelander-Institut für Astronomie, Universität Bonn
>
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