[Mesa-users] Problems with post-AGB track

Francis Timmes fxt44 at mac.com
Fri Nov 26 23:08:02 UTC 2021

hi janis,

a thermal pulse, among other things, increases the mass of the underlying co core.
one can see this in your movie (thanks, btw). from the core mass - luminosity relation
for a degenerate co core with h and he burning shell sources, one might expect the
luminosity to then increase. one can see this increase in your hr diagram. 
the luminosity should not, usually, be constant before and after.

is this sufficient to explain "luminosity is greater than the first time"?


> On Nov 25, 2021, at 10:54 AM, Janis Rodríguez <j.rodriguez at irya.unam.mx> wrote:
> Hi everyone,
> I've been working with evolution models of low-mass stars, some of them have experienced a very late thermal pulse (VLTP). When these models return through the post-AGB trace, they begin to increase their luminosity instead of remaining constant, as shown in the figure attached to the email. I've noticed that in these cases the He luminosity  is greater than the first time it passed through this trace, as shown in the video. I tried to restrict the changes in the He luminosity  but it has not worked. Do you have an idea how I can keep the brightness constant? 
> Thanks,
> Janis
> <HRD_BA_m19z15v1.pdf><m19z15v1.mp4><inlist_start>_______________________________________________
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