[mesa-users] Overshooting

[Kenny Van]

Hi, I was trying to produce some results using overshooting and it seems as
though regardless of timestep the plot produced doesn't seem very good. I
have attached the three plots I created using my data. The overshooting and
changes in timestep are said in the title. But just in case I will list all
the properties of the star.

&star_job

    mesa_dir = '/home/kvan/mesa_svn'

    create_pre_main_sequence_model = .true.

/ !end of star_job namelist


&controls

! initial parameter

  ! initial mass of star
    initial_mass = 20.0

  ! initial metallicity of star, MESA only goes from 0 to 0.04
    initial_z = 0.014

  ! initial helium mass fraction of star
    initial_y = 0.266

  ! changing the MLT to match that in Meynet
    mixing_length_alpha = 1.6

! overshooting

  ! all exponential overshooting is by default zero
  ! setting step overshooting
    step_overshoot_f_above_burn_h = 0.1
    overshoot_f0_above_burn_h = 0.1
    step_overshoot_f_below_burn_h = 0.1
    overshoot_f0_below_burn_h = 0.1
    step_overshoot_f_above_burn_he = 0.1
    overshoot_f0_above_burn_he = 0.1
    step_overshoot_f_below_burn_he = 0.1
    overshoot_f0_below_burn_he = 0.1
    step_overshoot_f_above_burn_z = 0.1
    overshoot_f0_above_burn_z = 0.1
    step_overshoot_f_below_burn_z = 0.1
    overshoot_f0_below_burn_z = 0.1

! Mass loss

  ! Changing mass loss so system acts like that of Ekstrom et al.
  ! Use Vink mass loss rate
    RGB_wind_scheme = 'Vink'
    Vink_wind_eta = 1

! timestep limits
  ! Limit magnitude of max change in log10 total pressure in any cell
    delta_lgP_limit = 0.2

  ! Limit magnitude of max change in log10 temperature in any cell
    delta_lgT_limit = 0.2

! when to stop

  ! max timestep size
    max_years_for_timestep = 500

  ! stop when we reach AGB to produce similar results to Maynet et al.
    stop_at_TP = .true.

  ! max age
    max_age = 1.0d10

/ ! end of controls namelist
[image: Inline image 7][image: Inline image 6][image: Inline image 5]

Thanks
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