[Mesa-users] The color and V band mag of the current Sun and solar-type stars

[M Sun]

Hello Aaron,

Thank you very much for your suggestion! I've tested with working in
simplex_solar_calibration directory and could produce a model close to the
current Sun. When I checked back the (B - V) mag, it still bluer than
observation about 0.03 mag. Here I attach the HR diagram, the color
magnitude diagram and R vs Age plot when running solar calibration
simulations. The initial conditions and the controls are attached as well.

The stars I am working on have a different metallicity, the (B - V) mag
disagreement between simulation and observation is bigger than this
(although L and Teff are in a good agreement, there is a 0.06 mag of (B -V)
between model and data). I am wondering if I forget some important physics
when computing the colors. Or does anyone have this issue before and how do
we fix it, especially near ZAMS and MS phase? Thanks!

cheers,
Meng

On Fri, Oct 4, 2019 at 3:05 PM Aaron Dotter <aaron.dotter at gmail.com> wrote:

> Before checking the magnitudes, I recommend you try to reproduce the solar
> Teff, L, and R.  See, for example, the simplex_solar_calibration in the
> test suite.
>
> Independently, check whether or not the mesa/colors module is able to
> reproduce the solar colors for the solar metallicity, Teff and log(g).
> This can be done irrespective of the solar evolutionary track; you can
> simply call the colors module with the solar parameters as input.
>
> On Fri, Oct 4, 2019 at 3:54 PM M Sun via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
>
>> Hello MESA users,
>>
>> Recently I am trying to produce some evolutionary tracks for solar-type
>> stars in an open cluster. The luminosity, effective temperature agree with
>> the observation very well. However, when I check the color magnitude
>> diagram, those solar-type stars seem much bluer than observation near the
>> main sequence phase.
>>
>> Then I tried to make a track for the current Sun with different initial
>> metallicities and mixing length factors (still in the proper range I
>> think), it is bluer than I expected as well. Here I attached my plot. The V
>> mag and B mag I used for the current Sun (shown in the red star in the
>> plot) are --
>> solar_abs_V = 4.83
>> solar_abs_B = 5.48
>> The open circles indicate the age at 1, 2 ... 6 Gyrs from the
>> bottom right to top left. I terminate the simulations after 6 Gyrs.
>>
>> I am using MESA 12115 in the test_suite working directory
>> "1M_pre_ms_to_wd". Here I attached my inlists and please let me know if you
>> need more information. The atmosphere table I used is 'photosphere'. Many
>> thanks!!
>>
>> cheers,
>> Meng
>> --------------
>> Meng Sun
>> University of Wisconsin Madison
>> https://sunmeng1118.wixsite.com/mysite
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
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