[mesa-users] Approx21

[Josiah Schwab]

Hi Ian,

> Overall, my goal has been to teach myself about stellar evolution by
> working through all star sizes from pre_ms to end point. But I have been
> stuck in the 9 to 13 MSun range with z=0.02. Many of these end up as WD
> which is OK. But reading the literature there should be a path in some
> cases where core collapse leads to electron capture supernova, but I have
> not been able to achieve this yet. It seems one component of achieving this
> is electron capture reactions on Mg24, Na23 and f20 which was why I am
> interested in the details of the composition of the various nets. approx21
> will not achieve this.

There's some nice work by Jones et al. stuyding this phase with MESA.

  http://adsabs.harvard.edu/abs/2013ApJ...772..150J

Sam has made his inlists and his net files available.  You may want to
take a look:

  https://github.com/swjones/mesa-Teile/tree/master/Jones.etal.2013.ApJ.772.150

Beware that if you just use that net, the e-capture reactions won't be
quite right.  The "special" weak rates described in Paxton et al. (2015)
Section 8 are necessary during this phase.  See

  http://mesa.sourceforge.net/star_job_defaults.html#controls_for_special_weak_rates

and the MESA test case star/test_suite/8.8M_urca.


Jones et al. use rate tables from Toki et al. (2013).  In the not too
distant future, things will be better in a MESA release.  Suzuki et
al. (2016) have a nice set of tables that MESA needs to learn to use.

  http://adsabs.harvard.edu/abs/2013PhRvC..88a5806T
  http://adsabs.harvard.edu/abs/2016ApJ...817..163S

That will happen approximately someday.

Hope that helps,
Josiah