[Mesa-users] Question about RSP and equilibrium quantities

[Jeremy Sakstein]

Hi Both,

I don't think it's periodu doubling because I just see a single harmonic
when I plot the light curves.

Sorry to be unclear. I am plotting the average stellar (surface) radius for
each pulsation cycle.

On Tue, Jan 21, 2020 at 9:37 AM Radek Smolec via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi Jeremy,
>
> It is difficult to guess what is happening without more detailed
> information. The effect you describe may be physical: for example
> low-amplitude period doubling phenomenon may be present in your model and
> then averages for even and odd pulsation cycles will differ.
> With such large difference you should be able to figure it out simply
> looking at the light or radius variation curve.
>
> For the general point; what you consider as "true equilibriu model"? RSP
> starts from equilibrium model, but it doesn't mean that the linear
> properties of the model, such as pulsation period, will not change when
> model pulsates at full amplitude.
> It is best to develop own procedures for computing such quantities as mean
> magnitude, radius, etc.
> Cheers,
> Radek
>
>
> wt., 21 sty 2020 o 20:20 Jeremy Sakstein <sakstein at sas.upenn.edu>
> napisał(a):
>
>> Hi Everyone,
>>
>> I have a quick question about finding the equilibrium values of the
>> stellar parameters when using RSP Cepheid.
>>
>> At the moment, I am taking a single pulsation cycle and averaging over
>> the radius throughout the cycle but this seems to give me two (very closely
>> separated values).
>>
>> Below I am plotting radius vs pulsation number. As you can see, I end up
>> with two very closely separated values for the average. Is this because the
>> model is changing ever so slightly between pulsations? If so, why does it
>> converge to two values and not a small scatter about the mean?
>>
>> [image: image.png]
>>
>> On a more general point, is it possible to extract the true equilibrium
>> model from the output rather than taking an average?
>>
>> Cheers,
>>
>> Jeremy
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