[mesa-users] Horizontal branch and zahb

[Aaron Dotter]

Hi Jeremy,

Why not start with the MESA test_suite case 'low_z'?  You can start with
that and change the stopping criterion (currently center limit on H).  See
"HB_limit" in controls.defaults for a convenient place to stop.  Use a
photo or model from ~500 steps prior to that point and you'll have one that
can be used effectively for create_zahb.

Aaron

On Fri, Jul 29, 2016 at 1:08 PM, Jeremy Sakstein <jeremy.sakstein at port.ac.uk
> wrote:

> Hi everyone
>
> I have what I suspect is a really stupid question but not really being a
> stellar structure person I'm struggling a bit.
>
> I'm trying to study RR Lyrae stars with Z=0.0001 so I've been studying the
> create_zahb and pre_zahb test_suite cases but the model has Z=0.02 so I'm
> trying to figure out how to repeat the process but failing miserably.
>
> My ultimate goal is to create a Z=0.0001 0.75 M zahb star that I can use
> as a starting model to evolve differently (I'm changing a parameter related
> to a modified gravity theory) through the RR Lyrae instability strip.
>
> If anyone can help me figure out which initial (pre_ms to near hb I
> suppose) model I should evolve to create the model that create_zahb can use
> to make the starting model I'm after I would really appreciate it. Ideally,
> I'd like to start outside the blue edge and evolve through it.
>
> Cheers,
>
> Jeremy
>
>
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