# rsp_Type_II_Cepheid¶

This test case checks the non-linear pulsation evolution of a 0.55 Msun, Teff = 6410 K, L = 136 Lsun, Z = 0.0001 metallicity model - type-II Cepheid of BL Her type based on Smolec and Moskalik (2014).

This test case has 1 part. Click to see a larger version of a plot.

• Part 1 (inlist_rsp_Type_II_Cepheid) creates the initial 0.65 Msun, 0.55 Msun, Teff = 6410 K, L = 136 Lsun, Z = 0.0001 metallicity model, and writes the results of conducting a linear nonadiabatic stability analysis to the LOGS directory (see Section 2.2 of MESA V for details). The evolution with RSP then begins. The convective parameters are such that the model should show deterministic chaos - lots of struggling between low and high amplitudes. The growth rates are large, so the attractor is approached only after ~20-40 cycles. After 10 periods, the run_star_extras.f90 checks if the energy conservation is less than 1e-5 and if fundamental period is within 1% of the expected 0.71262 day period. If these values are within bounds, then a message is written to the terminal and the run terminates:
rel_run_E_err  -1.0724594936404145E-007
good match for period   1.7372426555333260        1.7372399999999999


pgstar commands, in addition to those in inlist_rsp_pgstar_default which currently must be copied from one of the other rsp_* test suite cases, 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 = 100

pgstar_age_scale = 0.8
pgstar_age_lw = 3
pgstar_age_disp = 3.9
pgstar_age_coord = -0.11
pgstar_age_fjust = 0.0

pgstar_model_disp = 3.9

History_Panels2_txt_scale = 0.7
Profile_Panels2_txt_scale = 0.6
logL_R_txt_scale = 0.7
logL_v_txt_scale = 0.7
logL_Teff_txt_scale = 0.7

Grid2_win_flag = .true.
Grid2_win_width = 12
Grid2_title = 'rsp_Type_II_Cepheid'
Grid2_txt_scale_factor(:) = 1.0

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

/ ! end of pgstar namelist


Last-Updated: 27Jun2021 (MESA e2acbc2) by fxt.