Notebook criado para estudar os parametros do MESA

Parametros do controls.defaults

Parametros de malha (mesh adjustment)

  • mesh_delta_coeff = 1.0d0

    um valor alto diminui a quantidade de pontos de malha. Um valor pequeno aumenta a quantidade de pontos de malha

    a) mesh_delta_coeff_for_highT = 3.0d0

    usa um valor diferente para mesh_delta_coeff em temperaturas altas

    i) logT_max_for_standard_mesh_delta_coeff = 9.0d0

    usa mesh_delta_coeff para center log t <= do que o valor do parametro. Deve ser um valor menor do que o parametro abaixo

    ii) logT_min_for_highT_mesh_delta_coeff = 9.5d0

    usa mesh_delta_coeff para center log t >= do que o valor do parametro

  • max_dq = 1d-2

    tamanho maximo para as celulas como fracao da massa

    a) max_center_cell_dq = 1d-7

    maximo dq permitido no centro

    b)max_surface_cell_dq = 1d-12

    maximo dq permitido na superficie

  • max_num_subcells = 2

    limita o numero de camadas criadas a partir de 1 camada antiga

  • max_num_merge_cells = 2

    limita o numero de celulas antigas se fundirem um uma nova celula

  • mesh_dlog_3alf_dlogP_extra = 0.25d0

    multiplica mesh_delta_coeff pelo valor do parametro. um valor < 1 Aumenta a resolução onde há processo triple alfa

  • mesh_dlog_cno_dlogP_extra = 0.25d0

    multiplica mesh_delta_coeff pelo valor do parametro. um valor < 1 Aumenta a resolução onde há processo cno

star_H_mass_min_limit

Stop when star hydrogen mass in Msun units is < this. <= 0 means no limit.

max_star_mass_for_gain ¶

Automatic stops for mass loss/gain in Msun units (negative means ignore this parameter). Turn off mass gain when star mass reaches this limit.

min_star_mass_for_loss ¶

Automatic stops for mass loss/gain in Msun units (negative means ignore this parameter). Turn off mass loss when star mass reaches this limit.

max_T_center_for_any_mass_loss ¶

No mass loss for T center > this.

max_T_center_for_full_mass_loss ¶

No reduction in mass loss for T center <= this. This must be <= max_T_center_for_full_mass_loss. Reduce mass loss rate to 0 as T center climbs from max_for_full to max_for_any. The idea behind this is that during final stages of burning, there is so little time left in the life of the star, that any mass loss to winds will be negligible, but the inclusion of that insignificant mass loss can actually make convergence more difficult, so you are better off without it.

max_T_center_for_full_mass_loss = 1d9

wind_envelope_limit ¶

Winds automatically shut off when the hydrogen rich envelope mass is less than this limit. The value of h1_boundary_limit defines what is considered to be hydrogen poor. Mass in Msun units.

wind_envelope_limit = -1

dX_mix_dist_limit ¶

Option to ignore decreases in abundance in non-mixed cells near mixing boundaries. Ignore abundance changes if nearest mixing boundary is closer than this in Msun units. This applies to dH, dH_div_H, dHe, dHe_d_He, dX, and dX_div_X limits.

dX_mix_dist_limit = 1d-4


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