twin_studies

This test case exercise the capability to simultaneously evolve two model stars. The test vehicle is a pair of 15 Msun, Z=0.02 metallicity, models one with overshooting and one without overshooting.

inlist_multi_stars_job and the run_star_extras.f90 control the overall flow. For star 1, inlist_to_end_core_he_burn_header, inlist_common, inlist_mass_Z_wind_rotation, inlist_to_end_core_he_burn and inlist_star1 are read. The same is done for star 2, but with inlist_star2 which turns off overshooting being read. A pre-built 15 Msun, Z=0.02 metallicity, is then loaded for each model. Both models evolve simultaneously for 1.013e7 year.

Star 1, with overshooting, reaches the ending age in 80 steps:

Star 2, without overshooting, reaches the ending age in 273 steps. Star 2 is further along in its evolutionary path as might be expected without the extra fuel provided to the core by overshooting:

pgstar commands, in addition to those in inlist_pgstar used for the plots above for star 1:

&pgstar

  pgstar_interval = 1

  Grid1_title = 'star1 - with overshooting'

  file_white_on_black_flag = .true. ! white_on_black flags -- true means white foreground color on black background
  !file_device = 'png'            ! png
  !file_extension = 'png'

  file_device = 'vcps'          ! postscript
  file_extension = 'ps'

  Grid1_file_flag = .true.
  Grid1_file_dir = 'png1'
  Grid1_file_prefix = 'star1'
  Grid1_file_interval = 10

/ ! end of pgstar namelist

and for star 2:

&pgstar

  pgstar_interval = 1

  file_white_on_black_flag = .true. ! white_on_black flags -- true means white foreground color on black background
  !file_device = 'png'            ! png
  !file_extension = 'png'

  file_device = 'vcps'          ! postscript
  file_extension = 'ps'

  Grid1_title = 'star2 - without overshooting'

  Grid1_file_flag = .true.
  Grid1_file_dir = 'png2'
  Grid1_file_prefix = 'star2'
  Grid1_file_interval = 10

/ ! end of pgstar namelist

Last-Updated: 01Jul2021 (MESA 094ff71) by fxt.