[Mesa-users] Pre-Correction Frequencies

[Dennis Stello]

Hi Erica,

w/o having looked at your attachments (except the plots) my guess is 
that you found too different models in the two cases (Kjeldsen vs 
Ball).  The (pre-corrected) model found using Ball is clearly further 
from the 'best' model (its density is further from the observed) but the 
correction takes care of that.

However, if by 'look a little strange' you mean that the correction goes 
in the 'wrong direction', then it might be because you are not limiting 
the fitting coefficients.
I recall seeing similar issues when using the Kjeldsen correction (in a 
MESA simplex fit) for some stars.

But perhaps Warrick can chip in as well.

Best
Dennis/

On 23/12/2020 15:08, Erica Sawczynec wrote:
> Hi all!
>         I have a few questions about the frequency output in the 
> simplex_results.data file. I am trying to make an echelle diagram that 
> shows the frequencies before and after correction from the best fit 
> MESA model. When I use the Kjeldsen correction I am able to plot 
> l0_freq_# and get the results I expect, frequencies that lean slightly 
> to the right of the input frequencies, but when I use the Ball & Gizon 
> correction the uncorrected frequencies look a little strange. I’ve 
> attached an image below that demonstrates what I mean.
>
> So I just wanted to be sure anything labeled l(0,1,2)_freq_# is mean 
> to be the original output model frequency before correction and 
> l(0,1,2)_freq_corr_# is meant to be the frequency after using either 
> the Kjeldsen or Ball & Gizon correction. If that is true, I was 
> wondering why the Ball & Gizon pre-corrected frequencies look like 
> that? If not, what is the proper column I should be using to plot the 
> uncorrected model frequencies?
>
> I’ve also attached my inlist and simplex_results.data file below, let 
> me know if there is anything else I can provide that would be useful!
> Thanks,
> Erica
>
>
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-- 
DENNIS STELLO | Associate Professor
School of Physics | Faculty of Science

UNIVERSITY OF NEW SOUTH WALES
Rm136, K15 | University of New South Wales | NSW | 2052
T +61 2 9065 1334  | F +61 2 9385 6060
E d.stello at unsw.edu.au  | W http://www.physics.usyd.edu.au/~stello/

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