[Mesa-users] Suppressing CNO reactions

[Aaron Dotter]

Hi Rich,

In &star_job you can set these:

         !### num_special_rate_factors
         !### reaction_for_special_factor
         !### special_rate_factor
         ! For using other special rate factors.
         ! `num_special_rate_factors` must be <=
`max_num_special_rate_factors`.

      num_special_rate_factors = 0
      reaction_for_special_factor(:) = ''
      special_rate_factor(:) = 1

or in &controls you can set this:

         !### max_abar_for_burning

         ! if abar > this, suppress all burning
         ! e.g., if want an "inert" core heavy elements, set this to 55
         ! or, if want to turn off the net, set this to -1

      max_abar_for_burning = 199

Either one should give you the desired effect.

Aaron



On Mon, Mar 11, 2019 at 1:17 PM RICHARD H D TOWNSEND via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi folks --
>
> A question that I'm sure I've asked before, but I can't seem to find it in
> the archives: what's a straightforward approach to suppressing CNO
> reactions in a MESA run? I'd like to do this to demonstrate to my class
> what would happen to the luminosity of massive ZAMS stars if they were
> 'forced' to use the PP chain.
>
> cheers,
>
> Rich
>
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