[Mesa-users] Question regarding differences between version 10398 and version 15140

[Warrick Ball]

Hi Ealeal,

I haven't run the two cases to compare but I would guess that this is because of the new option

     pre_ms_relax_to_start_radiative_core = .true.

which was added to `&star_job` in r15140.  After creating the pre-MS model, this control lets the model contract down the Hayashi track until a radiative core first forms.  This is certainly what's happening if you see output like

     waiting for fully convective core to develop

at the start of the run.

Depending what you want to do, this may or not be what you want.  If not, you can disable it by setting that control to `.false.`.

Cheers,
Warrick

___________

Warrick Ball
Postdoc, School of Physics and Astronomy
University of Birmingham, Edgbaston, Birmingham B15 2TT
W.H.Ball at bham.ac.uk
+44 (0)121 414 4552

On Sun, 6 Feb 2022, mesa-users at lists.mesastar.org wrote:

> 
> 
> Dear MESA users,
> 
> I am trying to get into the new version of MESA (version 15140). So I run a simple comparison:
> 
> I run test suits of 1MS_pre_MS to WD in both the old version I had: 10398 and the version of 15140.
> 
> I understand differences can occur since the examples are not necessarily the same in the inlist or in the defaults of controls or star jobs.
> 
> So, I looked at the first value of the radius  in the history file at the first time of 10^-5 year in both versions:
> 
> In 15140 version it is:  logR = 2.8239618681609757E-001
> 
> In the 10398 version it is:  logR = 1.4680706932337271E+000  
> 
> Does anyone know why? It is a significant difference, and it appears to be a change in the preliminary conditions of MESA, or am I missing something?
> 
> Thank you very much,
> 
> Ealeal
> 
> 
> 
>