[mesa-users] Pulsating star in the HB using GYRE

[László Molnár]

Hi Cyrus,

that's odd... are those periods longer than 1.2 day? A naiive question
would be that is turbulent convection on in your model? Because that's
what creates the red edge of the instability strip.

Cheers,
László

László Molnár
-------------------------------------------
research fellow, PhD
IBVS editor
Konkoly Observatory
Budapest
-------------------------------------------


2016-01-24 14:26 GMT+01:00 Cyrus Zalian <thebigkiwi2003 at yahoo.fr>:
> Hi to everybody,
>
> First of all, I've started using Mesa a year ago, and it has been the most
> instructive tool by far. I thus wanted to thank the developers and all the
> mesa community for their help (as I had some silly questions sometimes).
>
> To sum it up : I'm studying RR Lyrae stars. I've been able to compute
> different models of HB stars (Masses from 0.5 to 0.88 by 0.05, and Z =
> 0.0001, 0.001, 0.002, 0.004 and 0.01) with no fancy option (no rotation, no
> mass loss, no semi convection nor overshoot).
>
> Now, I'm using GYRE to look for RR Lyrae among the HB stars following the
> procedure used in this excellent site :
> http://www.ster.kuleuven.be/~pieterd/mesa/instability_strip.html
>
> The problem was that there were more excited models than I thought. In
> attachment I've put an image of one HB star (can't remember the M and Z
> value) with the following color code :
>
> red = not excited
> blue = no fundamental excited but first overtone excited in the 0.2/1.2 days
> period range of RR Lyrae
> orange = fundamental excited (and maybe also overtones) in the 0.2/1.2 days
> period range of RR Lyrae
> green = excited mode but not in the range of RR Lyrae period
>
> Here is my problem : from what I know, there shouldn't be any pulsating star
> in the green range. So, is it normal that I have excited radial mode in this
> range ? If yes, how do I discriminate these stars from RR Lyrae (I did it by
> focusing on the one with the appropriate period, but it don't like that
> criteria that much) ?
>
> Thanking you all in advance.
>
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