[mesa-users] Color Outputs

[Robert Farmer]

Hi
So the following assumes your using 8845:

MESA currently only ships with a set a Johnson filter bands from
Lejeune, Cuisinier, Buser (1998) A&AS 130, 65-75. If you look in the
star_job.defaults you'll find in the color section

         color_num_files=1
         color_file_names(1)='lcb98cor.dat'
         color_num_colors(1)=11

The file lcb98cor.dat is in $MESA_DIR/data/colors_data.

To use this then leave the star_job alone (as by default we use the
lcb98cor.dat file) and go to your history_columns.list file, where there
are four options:

bc filter
abs_mag filter
add_bc
add_abs_mag

bc options provide the bolometric corrections while the abs_mag give the
absolute magnitude. The options add_bc and add_abs_mag will output the
bc/abs_mags for all the filters specified in the files specified in
color_file_names. The other two options bc filter and abs_mag filter allow
you to specify which filter band passes you want outputting.

So if you look in the lcb98cor.dat file you'll see the header is Teff logg
met then its v b u  r  i  k  h  j  l lprime  m. So if you wanted the
bolometric corrections for the v, b and u bands only you would add to your
history file

bc v
bc b
bc u

To select only those band passes, and similarly for the absolute magnitudes
it would be:
abs_mag v
abs_mag b
abs_mag u

Now to add the hubble band passes. You can give MESA your own bolometric
correction file with the hubble values in and MESA will use that instead.

The first 3 columns of this file must be theTemp, log g and metalicitiy
(they do not need to be in any kind of sorted order) and the rest of the
columns are the bolometric corrections for each band pass you are
interested in. Note you need to name each band pass uniquely, so the header
might look this:

#teff logg met F122M F160BW

Then fill in the columns with the relevant values.

Then put this file in your working directory and add this to your star_job
inlist

         color_num_files=1
         color_file_names(1)='your_hubble_filename'
         color_num_colors(1)=number_of_filters_in_file

And add to you history file either add_bc or add_abs_mag to get all of them
or add

bc F122M (from my example but add in whatever you put in the header)

In principle you could load multiple files of bolometric corrections up,
but there is a bug in 8845 so you should only use one file.

Rob




On Tue, Jan 10, 2017 at 1:38 AM, Sanskriti Das <dassanskriti at gmail.com>
wrote:

> Hello,
>
> MESA turns out to calculate and store color in different formats (I found
> four different commands for that) but it is not clear which command does
> exactly what. The bands/filters in which it is calculating the colors is
> not clear. Is it the HST filters or anything else? Can anyone please tell
> the details for that? It would be very helpful then.
>
> Thank you.
>
> Regards,
> Sanskriti
> MSc 2nd Year, IIT Bombay
> Project student at DAA, TIFR, Mumbai
>
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