[Mesa-users] Lithium and berylium evolution track

amber lauer amber.lauer at tunl.duke.edu
Mon Feb 19 10:56:30 EST 2018

On Sat, Feb 17, 2018 at 8:33 PM, Josiah Schwab via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi Aishah,
> > I want to know if there is a way I could produce li-7 and Be-8
> > evolution tracks using MESA?  Please advise because I notice I can
> > only display only certain abundances in the pgstar control.
> ​What do you mean you can only display certain abundances? I assume you
are referring to the abundance plot, but you can display any isotope in the
net.​ If you open the file /mesa/star/defaults/pgstar.defaults, and locate
the section for the abundance window, you'll
see that you can specify any isotope using the commands

   Abundance_num_isos_to_show = 4
         Abundance_which_isos_to_show(1) = 'h1'
         Abundance_which_isos_to_show(2) = 'he3'
         Abundance_which_isos_to_show(3) = 'he4'
         Abundance_which_isos_to_show(4) = 'c12'

​Note that these are just examples to show you the format. Again, any
isotope in the net can be shown this way. Another important note: if you
leave the abundance window to its own devices it will display the most
abundant isotops (anyone know how many by default?).
This in itself is not unusual but the "most abundant" isotopes can change,
which means when they do MESA will change the color code for each
abundance, which some people find confusing. So even if the "most abundant
isotope" scheme is enough for your needs it might be useful to try the
other method just for clarity.  ​

> You can display any abundances that are included in the MESA stellar
> model in pgstar.  If you want to study these isotopes you should make
> sure they are a part of your nuclear network.
> You can change the nuclear network with the control
>   http://mesa.sourceforge.net/star_job_defaults.html#change_net
> and there is information about the nuclear networks in the files
>   $MESA_DIR/data/net_data/nets/README
>   $MESA_DIR/data/net_data/NET_NOTES
> The network pp_extras.net extends the basic network by adding h2, li7,
> be7, b8, so that seems like what you might want.
> Given its short lifetime, nets essentially never explicitly include
> Be-8, though it is implicitly included in relevant reaction chains
> (i.e. triple alpha, PP III).
> Hope that helps,
> Josiah
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users

Amber Lauer
Postdoctoral Researcher
Triangle University Nuclear Lab
Duke University
amber.lauer at tunl.duke.edu <amber.lauer at duke.edu>
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