ns_h

This test case shows an example of steady hydrogen burning within a neutron star envelope.

This test case has 2 parts. Click to see a larger version of a plot.

  • Part 1 (inlist_add_he_layer) first loads a prebuilt neutron star envelope model ns_env.mod, see the make_env test case. Helium is then accreted at a rate of 1e-9 Msun/year for 0.5 seconds to create a thin helium layer:

../_images/grid_000108.png

  • Part 2 (inlist_to_steady_h_burn) continues the evolution by accreting a hydrogen-rich solar mixture at a rate of 1e-11 Msun/year. Hydrogen burning eventually reaches a steady location, logxm = log10((Mstar - m) / Msun) = -12.8, within the neutron star envelope after 2e5 seconds of evolution:

../_images/grid_000381.png

pgstar commands used for the plot above:

&pgstar

 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'

 pgstar_interval = 10

 pgstar_grid_title_disp = 1.8

 Abundance_xaxis_name = 'logxm'
 Abundance_xaxis_reversed = .true.
 Abundance_xmin = -16.0
 Abundance_xmax = -12.0

 Power_xaxis_name = 'logxm'
 Power_xaxis_reversed = .true
 Power_xmin = -16.0
 Power_xmax = -12.0

 Profile_Panels1_title = ''
 Profile_Panels1_num_panels = 2

 Profile_Panels1_xaxis_name = 'logxm'
 Profile_Panels1_xaxis_reversed = .true.
 Profile_Panels1_xmin = -101d0
 Profile_Panels1_xmax = -101d0

 Profile_Panels1_yaxis_name(1) = 'logRho'
 Profile_Panels1_yaxis_name(2) = 'logT'
 Profile_Panels1_ymin(1) = -101

 Profile_Panels1_other_yaxis_name(1) = 'logP'
 Profile_Panels1_other_yaxis_name(2) = 'entropy'
 Profile_Panels1_other_ymin(1) = -101

 Profile_Panels2_title = ''
 Profile_Panels2_num_panels = 2

 Profile_Panels2_xaxis_name = 'logxm'
 Profile_Panels2_xaxis_reversed = .true.
 Profile_Panels2_xmin = -101d0
 Profile_Panels2_xmax = -101d0

 Profile_Panels2_yaxis_name(1) = 'luminosity'
 Profile_Panels2_yaxis_name(2) = 'net_nuclear_energy'
 Profile_Panels2_ymin(1) = -101
 Profile_Panels2_ymin(2) = -101

 Profile_Panels2_other_yaxis_name(1) = 'opacity'
 Profile_Panels2_other_yaxis_name(2) = 'eps_nuc_neu_total'
 Profile_Panels2_other_ymin(1) = -101
 Profile_Panels2_other_ymin(2) = -101

 Text_Summary1_txt_scale = 5.5

 Text_Summary1_num_rows = 5
 Text_Summary1_num_cols = 3
 Text_Summary1_name(1, 1) = 'model_number'
 Text_Summary1_name(2, 1) = 'star_age_sec'
 Text_Summary1_name(3, 1) = 'time_step_sec'
 Text_Summary1_name(4, 1) = 'log_rel_run_E_err'
 Text_Summary1_name(5, 1) = 'total_energy'
 Text_Summary1_name(1, 2) = 'envelope_mass'
 Text_Summary1_name(2, 2) = 'log_abs_mdot'
 Text_Summary1_name(3, 2) = 'log_xmstar'
 Text_Summary1_name(4, 2) = 'm_center'
 Text_Summary1_name(5, 2) = 'r_center_km'
 Text_Summary1_name(1, 3) = 'num_zones'
 Text_Summary1_name(2, 3) = 'num_iters'
 Text_Summary1_name(3, 3) = 'num_retries'
 Text_Summary1_name(4, 3) = ' '
 Text_Summary1_name(5, 3) = ' '

 Grid2_title = 'ns_h'
 Grid2_plot_name(1) = 'Profile_Panels1'
 Grid2_plot_name(2) = 'Text_Summary1'
 Grid2_plot_name(3) = 'Abundance'
 Grid2_plot_name(4) = 'Power'
 Grid2_plot_name(5) = 'Profile_Panels2'
 Grid2_plot_row(1) = 1
 Grid2_plot_row(2) = 7
 Grid2_plot_row(3) = 1
 Grid2_plot_row(4) = 5
 Grid2_plot_row(5) = 1
 Grid2_plot_rowspan(1) = 6
 Grid2_plot_rowspan(2) = 2
 Grid2_plot_rowspan(3) = 4
 Grid2_plot_rowspan(4) = 4
 Grid2_plot_rowspan(5) = 6
 Grid2_plot_col(1) = 1
 Grid2_plot_col(2) = 1
 Grid2_plot_col(3) = 5
 Grid2_plot_col(4) = 5
 Grid2_plot_col(5) = 3
 Grid2_plot_colspan(1) = 2
 Grid2_plot_colspan(2) = 4
 Grid2_plot_colspan(3) = 3
 Grid2_plot_colspan(4) = 3
 Grid2_plot_colspan(5) = 2
 Grid2_plot_pad_left(1) = -0.02
 Grid2_plot_pad_left(2) = -0.08
 Grid2_plot_pad_left(3) = 0.14
 Grid2_plot_pad_left(4) = 0.14
 Grid2_plot_pad_left(5) = 0.06
 Grid2_plot_pad_right(1) = 0.07
 Grid2_plot_pad_right(2) = -0.12
 Grid2_plot_pad_right(3) = 0
 Grid2_plot_pad_right(4) = 0
 Grid2_plot_pad_right(5) = -0.01
 Grid2_plot_pad_top(1) = 0
 Grid2_plot_pad_top(2) = 0.08
 Grid2_plot_pad_top(3) = 0
 Grid2_plot_pad_top(4) = 0.06
 Grid2_plot_pad_top(5) = 0
 Grid2_plot_pad_bot(1) = 0
 Grid2_plot_pad_bot(2) = -0.04
 Grid2_plot_pad_bot(3) = 0.09
 Grid2_plot_pad_bot(4) = 0.03
 Grid2_plot_pad_bot(5) = 0
 Grid2_txt_scale_factor(1) = 0.65
 Grid2_txt_scale_factor(2) = 0.19
 Grid2_txt_scale_factor(3) = 0.65
 Grid2_txt_scale_factor(4) = 0.65
 Grid2_txt_scale_factor(5) = 0.65

 Grid2_num_cols = 7
 Grid2_num_rows = 8
 Grid2_num_plots = 5

 Grid2_win_flag = .true.
 Grid2_win_width = 16
 Grid2_win_aspect_ratio = 0.6

 Grid2_file_flag = .true.
 Grid2_file_dir = 'pgstar_out'
 Grid2_file_prefix = 'grid_'
 Grid2_file_interval = 10000
 Grid2_file_width = 20
 Grid2_file_aspect_ratio = -1

/ ! end of pgstar namelist

Last-Updated: 21Jun2021 (MESA e2acbc2) by fxt.