Model Namelist Group

The &model namelist group controls how the stellar model is set up. The following options are available:

model_type (type: string, default: '')

Type of stellar model; one of

• 'HOM' : Homogeneous compressible model

• 'POLY' : Polytropic model read from external file

• 'ANAPOLY_0' : Analytic polytropic model with \(\npoly=0\)

• 'ANAPOLY_1' : Analytic polytropic model with \(\npoly=1\)

• 'ANAPOLY_5' : Analytic polytropic model with \(\npoly=5\)

• 'ANAPOLY_5_1' : Analytic polytropic model with \(\npoly=5,1\)

• 'EVOL' : Evolutionary model read from external file

file (type: string, default: '')

Name of file. Used only when model_type= 'POLY' | 'EVOL'

file_format (type: string, default: '')

Format of file; one of

• 'AMDL' : AMDL-format binary file

• 'B3' : B3-format HDF5 file

• 'FAMDL' : FAMDL-format text file

• 'FGONG' : FGONG-format text file

• 'GSM' : GSM-format HDF5 file

• 'LOSC' : LOSC-format text file

• 'MESA' : MESA/GYRE-format text file

• 'OSC' : OSC-format text file

• 'WDEC' : WDEC-format text file

Used only when model_type= 'EVOL'

data_format (type: string, default: '')

Fortran format specifier for data read from OSC-, FGONG- and FAMDL-format files. If left blank, format is auto-selected

deriv_type (type: string, default: 'MONO')

Cubic interpolation derivatives type; one of

• 'SPLINE' : Spline (non-local) derivatives

• 'FINDIFF' : Finite-difference derivatives

• 'MONO' : Monotonized derivatives

Used only when model_type = 'EVOL' and interp_type = 'CUBIC'

Gamma_1 (type: real, default: 5/3)

First adiabatic exponent. Used only when model_type = 'HOM' | 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5' | 'ANAPOLY_5_1'

theta_s (type: real, default: 0)

Surface value of polytropic dependent variable. Used only when model_type = 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5'

x_match (type: real, default: 0.5)

Radial coordinate of match point between inner and outer regions. Used only when model_type = 'ANAPOLY_5_1'

grid_type (type: string, default: 'UNI')

Model grid type; one of

• 'UNI' : Uniform spacing

• 'GEO' : Geometric spacing

• 'LOG' : Logarithmic spacing

Used only when model_type = 'HOM' | 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5' | 'ANAPOLY_5_1'

n (type: integer, default: 10)

Number of points in model grid. Used only when model_type = 'HOM' | 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5' | 'ANAPOLY_5_1'

s (type: real, default: 1)

Skewness coefficient for model grid. Used only when model_type = 'HOM' | 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5' | 'ANAPOLY_5_1' and grid_type = 'GEO | LOG'

x_i (type: real, default: 0)

Inner boundary coordinate of model grid. Used only when model_type = 'HOM' | 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5' | 'ANAPOLY_5_1'

x_o (type: real, default: 1)

Outer boundary coordinate of model grid. Used only when model_type = 'HOM' | 'ANAPOLY_0' | 'ANAPOLY_1' | 'ANAPOLY_5' | 'ANAPOLY_5_1'

dx_snap (type: real, default: 0)

Threshold for snapping model points together; if a pair of points are separated by less than dx_snap, they are snapped together. Used only when model_type = 'EVOL'

add_center (type: logical, default: .TRUE.)

Flag to add a center point to the model; if a point does not already exist at the origin, then one is added. Used only when model_type = 'EVOL' | 'POLY'

interp_type (type: string, default: 'CUBIC')

Interpolation type; one of

• 'CUBIC' : Piecewise cubic

• 'LINEAR' : Piecewise linear

Used only when model_type = 'EVOL' | 'POLY'

repair_As (type: logical, default: .FALSE.)

Flag to repair inaccuracies in the dimensionless Brunt-Väisälä frequency at density discontinuities

constrain_derivs (type: logical, default: .TRUE.)

Flag to constrain first derivatives of \(V_2\), \(U\) and \(c_1\) structure coefficients, in accordance with equations (20) and (21) of Takata (2006a) and the hydrostatic equilibrium equation. Used only when model_type = 'EVOL' 'POLY'

use_nabla_rad (type: logical, default: .FALSE.)

Obtain the radiative luminosity \(\Lrad\) from \(\nabrad\). Used only when model_type = 'EVOL' and file_format = 'OSC'