[mesa-users] tracking C13

[Robert FARMER]

So if you have a look at the $MESA_DIR/data/nets_data/nets/
pp_and_cno_extras.net you'll see that it has:

         include 'basic.net'

         include 'add_pp_extras'

         include 'add_cno_extras'

So you get the basic.net isotopes and reactions plus a load of others
defined in the add_pp_extras and add_cno_extras files. So the differences
are going to be in which reactions and isotopes are taking place. Though
simply saying the runs differ doesn't give us a lot to go. Do they differ
significantly? Does this impact whatever quantity it is want to measure? Do
you expect your star to undergo the reactions listed in add_pp_extras and
add_cno_extras?

What you could do if you only want c13 is in your work directory create a
file local.net and add these lines:
include 'basic.net'
add_iso(c13)

Then set
change_net = .true.
new_net_name = ’local.net <http://pp_and_cno_extras.net>’

This way you only get c13 and not all the extra isotopes and reactions
defined in  add_pp_extras and add_cno_extras. Of course you also need to
work out if you need to include other isotopes as part of possible c13
reactions

Rob






On Wed, Mar 18, 2015 at 3:06 PM, Odette Toloza <odette.toloza at gmail.com>
wrote:

> Hi MESA users
>
> I want to see the variations of the CNO burning ratios on the surface. So
> I need to get the carbon-13. I have included in the history_columns.list
> surface c13, but it only records  zeros in the history.data file.
>
> I have found that it is because the default nuclear network basic.net
> only tracks 8 isotopes, So I have included the following lines to track
> another ones
>
> change_net = .true.
> new_net_name = ’pp_and_cno_extras.net’
>
>
> and with that I am getting non-zero values for c-13, but If I compare
> using basic.net and pp_and_cno_extras.net at different points during the
> evolution they differ. What is the difference between
> pp_and_cno_extras.net and basic.net? is it not only that one tracks or
> not other isotopes?
>
> Cheers,
> Odette.
>
>
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