[Mesa-users] Convective Mass Region in MESA

[anne.thoul at uliege.be]

Dear Anindya,

If you look at the mesa/star/defaults/history_columns.list file you will find the following lines. Uncommenting the line mixing_regions will add columns in your history.data file with information about all the regions in the star with different mixing types, including the top and bottom locations of the convective envelope.

Anne


!## mixing regions

     mass_conv_core ! (Msun) mass coord of top of convective core.  0 if core is not convective

     !  mx1 refers to the largest (by mass) convective region.
     !  mx2 is the 2nd largest.

     !  conv_mx1_top and conv_mx1_bot are the region where mixing_type == convective_mixing.
     !  mx1_top and mx1_bot are the extent of all kinds of mixing, convective and other.

     ! values are m/Mstar
     conv_mx1_top
     conv_mx1_bot
     conv_mx2_top
     conv_mx2_bot
     mx1_top
     mx1_bot
     mx2_top
     mx2_bot

     ! radius -- values are radii in Rsun units
     !conv_mx1_top_r
     !conv_mx1_bot_r
     !conv_mx2_top_r
     !conv_mx2_bot_r
     !mx1_top_r
     !mx1_bot_r
     !mx2_top_r
     !mx2_bot_r

     ! you might want to get a more complete list of mixing regions by using the following

     !mixing_regions <integer> ! note: this includes regions where the mixing type is no_mixing.

        ! the <integer> is the number of regions to report
        ! there will be 2*<integer> columns for this in the log file, 2 for each region.
        ! the first column for a region gives the mixing type as defined in const/public/const_def.f90.

        ! the second column for a region gives the m/mstar location of the top of the region
        ! entries for extra columns after the last region in the star will have an invalid mixing_type value of -1.
        ! mstar is the total mass of the star, so these locations range from 0 to 1
        ! all regions are include starting from the center, so the bottom of one region
        ! is the top of the previous one.  since we start at the center, the bottom of the 1st region is 0.

        ! the columns in the log file will have names like 'mix_type_1' and 'mix_qtop_1'

        ! if the star has too many regions to report them all,
        ! the smallest regions will be merged with neighbors for reporting purposes only.


     !mix_relr_regions <integer>
        ! same as above, but locations given as r/rstar instead of m/mstar.
        ! the columns in the log file will have names like 'mix_relr_type_1' and ‘mix_relr_top_1'


> Le 11 oct. 2019 à 03:39, Anindya Ganguly via Mesa-users <mesa-users at lists.mesastar.org> a écrit :
> 
> Hi,
> 
> I am a new user of MESA. For my model, I want to know how to get the information of the top and bottom of the convective envelope zone of  different mass stars.
> I shall be highly obliged if you kindly help me to solve the problem.
> 
> Anindya Ganguly
> Tata Institute Of Fundamental Research
> Mumbai,India
> 
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