[Mesa-users] Turning Off Nuclear Fusion in 1M Star

[Rob Farmer]

Hi,
The other options you can use are:

dxdt_nuc_factor = 0

which turns off composition change from burning, but does not turn off the
eps_nuc, so the star wont collapse when its burning is turned off, but it
also wont evolve.

Or you can use:

eps_nuc_factor = 0

To turn off the energy from burning without however turning off the
composition change from the nuclear reactions.

Rob



On Sun, 24 Feb 2019 at 02:24, Evan Bauer <ebauer at physics.ucsb.edu> wrote:

> Hi Madison,
>
> The easiest way to completely shut off all nuclear reactions is to include
> this control:
>
> max_abar_for_burning = -1
>
>
> Cheers,
> Evan
>
> On Feb 23, 2019, at 5:13 PM, Madison Lyn Fitzgerald-Russell <
> madison.l.fitzgerald at wmich.edu> wrote:
>
> Hello again MESA users,
>
> I am interested in comparing the evolution of a 1M star (using the
> 1M_pre_ms_to_wd test suite) with nuclear fusion turned both off and on. On,
> of course, is the default, but I'm having some trouble with making sure any
> related nuclear reactions are turned off for the "without" runs.
>
> So far, I have tried using the
> net_logTcut_lo = 15.0
> command in order to turn off reactions about 10^15 K. However, my plot did
> not behave as expected (I've attached my inlist for this run and the plots
> I generated), with my supposed non-fusion run giving me almost exactly the
> same graph as my fusion run.
>
> I have checked the documentation and the archive, but I am uncertain how
> to turn all nuclear fusion reactions off. Any suggestions for how to make
> sure nuclear reactions are turned off?
>
> I'm running MESA version 10398 on a remote 64-bit Linux server.
>
> Thank you,
> Madison Fitzgerald-Russell
>
> Doctoral Scholar Assistant
> Department of Physics & The Mallinson Institute for Science Education
> Western Michigan University
>
> <1M no fusion HR.png>
> <1M with fusion HR.png>
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