[Mesa-users] Color File from MIST

[Aldo Serenelli]

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>
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>

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