[Mesa-users] Color File from MIST

Fri Aug 27 09:27:27 UTC 2021

Hi Aldo,

Yes that’s it! Thank you so much. 
Silly me just combined the complete tables from MIST without filtering for the Av value. I guess MESA then uses the last occurrence of a teff logg fe/h set to interpolate which is as you mentioned the one for Av = 6.
I just ran another model with the new MESA_corrs and it absolutely was that!. 

Thank you again,
Thomas

> Am 27.08.2021 um 11:12 schrieb Aldo Serenelli via Mesa-users <mesa-users at lists.mesastar.org>:
> 
> Hi Thomas, 
> 
> I can't comment on the details on how you are producing the CMD based on the bolometric corrections, but note the file you have sent with the BCs include many BCs for given T, logg, Fe/H values which relate to different Av values. These probably correspond to the different possible reddening values tabulated in the MIST BCs. As an example, here's an extract from your file for the Gaia magnitudes:
> 
> 5500.0 4.0 0.0 0.06188 -0.29692 0.58633
> 5500.0 4.0 0.0 0.01879 -0.35041 0.55383
> 5500.0 4.0 0.0 -0.02415 -0.40381 0.52137
> 5500.0 4.0 0.0 -0.06695 -0.45713 0.48894
> 5500.0 4.0 0.0 -0.10961 -0.51036 0.45655
> 5500.0 4.0 0.0 -0.19451 -0.61656 0.39188
> 5500.0 4.0 0.0 -0.27884 -0.72241 0.32737
> 5500.0 4.0 0.0 -0.44586 -0.93312 0.19879
> 5500.0 4.0 0.0 -0.61071 -1.14253 0.07081
> 5500.0 4.0 0.0 -0.77343 -1.35068 -0.05657
> 5500.0 4.0 0.0 -1.55693 -2.37378 -0.6844
> 5500.0 4.0 0.0 -2.99254 -4.34642 -1.89552
> 5500.0 4.0 0.0 -4.28967 -6.24614 -3.05049
> 
> The first row corresponds to Rv=3.1 and Av=0, the last to Av=6.0. Note that BCs are strongly affected by this. Could it be your interpolation is using BCs corresponding to high Av values, therefore much reddened and dimmer as your CMD suggests? If this is the case, then make sure you are using the tables for the correct Av value.
> 
> I hope this helps.
> 
> Aldo
> 
> 
> On 27/8/21 09:28, Thomas Steindl wrote:
>> Dear MESA users,
>> 
>> I am trying to produce Colour Magnitude diagrams for GAIA. To do so, I have downloaded the bolometric correction tables for UBV(RI)c + 2MASS + Kepler + Hipparcos + Tycho + Gaia from the MIST model grids and combined them to a MESA_corrs.txt file. However, the output looks significantly different from the MIST stellar evolution track that I can download for the same mass and filter bands. I have checked that the evolutionary track looks quite similar in the Hertzsprung-Russel diagram so I assume I did make some silly mistake either creating the MESA_corrs file or when reading it into MESA.
>> 
>> I am using r12778 and attach minimal working directory as well as a plot showing the different evolutionary tracks. I am looking forward to hear from you and hope you can help me find my mistake. Thank you in advance!
>> 
>> Best,
>> Thomas
>> __________________________________________________________________
>> 
>> Thomas Steindl, MSc
>> University of Innsbruck | Institute for Astro- and Particle Physics
>> Tel: +43 512507 52031
>> Mail: thomas.steindl at uibk.ac.at <mailto:thomas.steindl at uibk.ac.at>
>> Homepage: www.thomassteindl.com <http://www.thomassteindl.com/>
>> 
>> 
>> 
>> 
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