[mesa-users] Creating model grids with frequencies

Warrick Ball wball at astro.physik.uni-goettingen.de
Fri Jan 17 05:56:24 EST 2014


This is mostly to cover the main sequence and early subgiant branch, for 
masses between about 0.8 and 1.8.  I'd usually be looking for the l = 
0,1,2 with about 4 radial orders either side of the mode closest to nu_max 
from scaling relations.  The primary purpose would currently be grid-based 
modelling with large and small separations computed from the oscillation 

I previously constructed smaller grids like this using CESAM, but the 
method there was to save the FGONG model for each step and compute the 
oscillation frequencies after the evolution was complete.

I hope that helps answer the questions!


On Fri, 17 Jan 2014, Anne Thoul wrote:

> Dear Warrick,
> I am not sure I understand what you want to do. What is the purpose of the grid? What mass range are you talking about? What frequency ranges
> do you want to include in your grid? Which modes? Depending on what you want to do, you have to choose carefully how and what frequencies you want to calculate.
> Cheers,
> Anne
> Le 17 janv. 2014 à 11:05, Warrick Ball <wball at astro.physik.uni-goettingen.de> a écrit :
>> Hi MESAlians,
>> I'm about to try to use MESA to construct some model grids with oscillation frequencies.  I thought I'd ask if anyone has already developed tools for doing so before I try my own thing.  That is, just as one would have a collection of evolutionary tracks, for e.g. different metallicity, with, say, Teff, L and other observables, I'm going to construct grids that have oscillation frequencies, too.
>> My basic strategy will be to start with the "pulse" test case.  I'll modify the inputs in the code for the desired ell and frequency ranges, then tinker with the ADIPLS input files for any other parameters I want to fix (e.g. how the normalized mode energy is normalized).  Because I'm not master coder, I'll probably just dump the output to some sort of text file, of which I'll make sense later, probably in Python.
>> If anyone can offer some points, I'll be super grateful.  And, by the same token, I'll share what I end up doing and where I find any stumbling blocks.
>> (Currently, I've got the output being spewed out for a given evolutionary run but I'm not choosing the frequency range wisely and getting a ton of stuff on the pre-MS.  I'll probably start from the ZAMS for now instead.)
>> Cheers,
>> Warrick
>> ------------
>> Warrick Ball
>> Postdoc, Institut für Astrophysik Göttingen
>> wball at astro.physik.uni-goettingen.de
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Warrick Ball
Postdoc, Institut für Astrophysik Göttingen
wball at astro.physik.uni-goettingen.de
+49 (0) 551 39 5069

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