[Mesa-users] Issues Resolving Pulsations for a Second-Crossing Cepheid

[Radek Smolec]

Dear Ewen,

For most applications I can think of an envelope model of Cepheid created
with RSP should be fine. Then you are not using a full structure model from
MESA evolutionary run. Just record the physical parameters, M, L, Teff, Y
and Z and give these as input to RSP, which will create a homogeneous
envelope model and then evolve the model from initial perturbation to full
amplitude pulsation. See MESA fifth instrument paper and rsp_Cepheid test
suite.
Best wishes,
Radek

pon., 16 cze 2025 o 21:59 Ewen Francis MacKenzie Whyte via Mesa-users <
mesa-users at lists.mesastar.org> napisał(a):

> Hi all,
>
>
>
> My goal is to evolve a 10 solar mass Cepheid to the blue loop and save the
> model when it is close to the blue edge of the instability strip during the
> second crossing. At that point I would like to drop the timestep to a few
> hours and start generating a light curve to resolve the Cepheid’s
> pulsations.
>
>
>
> Thus far I have had no success in this endeavour. I have tried many
> different solutions like increasing the number of zones, attempting RSP
> analysis, lowering the star’s mass, using a finer temporal resolution, and
> so on. I am happy to provide inlists that I used if that helps.
> Unfortunately, none of my results have pointed to a pulsating Cepheid.
>
>
>
> I figured you all might have some new ideas for me to try, or controls
> that I am missing. Let me know your thoughts!
>
>
>
> Sincerely,
>
>
>
> Ewen
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>
>
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