[Mesa-users] he_core_mass definition

Rob Farmer r.j.farmer at uva.nl
Thu Apr 11 03:38:50 EDT 2019


See the "definition of core boundaries" in the controls.defaults file but
basically the helium core mass is defined where the he4 fraction in a zone
is above "min_boundary_fraction" (0.1d0) and the h1 fraction is below
"he_core_boundary_h1_fraction" (0.01d0)


On Thu, 11 Apr 2019 at 08:22, Gökhan Yücel <gokhanyucel at akdeniz.edu.tr>

> Dear MESA users,
> I have a weird problem/question about "he_core_mass" definition. What is
> the exact definition of this term?
> This is why I'm asking. I have been trying to see how much helium core is
> being created by hydrogen burning in single stars until TAMS, and binary
> stars until mass transfer. When I check my output files, I see that
> "he_core_mass" is 0 for a long time then it goes up from 0 to some small
> number, such as 0.24, then mass transfer begins. Since most of stars starts
> to burn their hydrogen to helium after immediately they enter the ZAMS, so
> this "he_core_mass" should be more than 0 in a very short time after the
> evolution star. So, what is this he_core_mass?
> I attached a file that shows the change of "helium_core_mass" against time
> for a single star.
> Regards,
> Gökhan_______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
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