Stellar Model Parameters

The &model namelist group defines stellar model parameters, as follows:

model_type

Type of model to use; 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

Name of file (when model_type= 'POLY'|'EVOL')

file_format

Format of file (when model_type= 'EVOL'); 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

data_format (default '', indicates auto-select)

Fortran format specifier for data read from OSC-, FGONG- and FAMDL-format files

deriv_type (default 'MONO')

Cubic interpolation derivatives type (when model_type='EVOL' and interp_type='CUBIC'); One

'SPLINE' : Spline (non-local) derivatives
'FINDIFF' : Finite-difference derivatives
'MONO' : Monotonized derivatives (default)

Gamma_1 (default 5/3)

First adiabatic exponent (when model_type='HOM'|'ANAPOLY_*')

theta_s (default 0)

Surface value of polytropic dependent variable (when model_type='ANAPOLY_0'|'ANAPOLY_1'|'ANAPOLY_5')

x_match (default 0.5)

Radial coordinate of match point between inner and outer regions (when model_type='ANAPOLY_5_1')

grid_type (default 'UNI')

Model grid type (when model_type='HOM'|'ANAPOLY_*'); one of

'UNI' : Uniform spacing
'GEO' : Geometric spacing
'LOG' : Logarithmic spacing

n (default 10)

Number of points in model grid (when model_type='HOM'|'ANAPOLY_*')

s (default 1)

Skewness parameter for model grid (when model_type='HOM'|'ANAPOLY_*' and grid_type='GEO'|'LOG')

x_i (default 0)

Inner boundary coordinate of model grid (when model_type='HOM'|'ANAPOLY_*')

x_o (default 1)

Outer boundary coordinate of model grid (when model_type='HOM'|'ANAPOLY_*')

dx_snap (default 0)

Threshold for snapping model points together, when model_type is 'EVOL'. If a pair of points are separated by less than dx_snap, they are snapped together.

add_center (default .TRUE.)

Flag to add a center point to the model (when model_type='EVOL'|'POLY'). If a point does not already exist at the origin, then one is added

interp_type (default 'CUBIC')

Interpolation type (when model_type='EVOL'|'POLY'); one of

'CUBIC' : Piecewise cubic
'LINEAR' : Piecewise linear

repair_As (default .FALSE.)

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

constrain_derivs (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 (when model_type='EVOL')

use_nabla_rad (default .FALSE.)

Use \(\nabrad\) to calculate the radiative luminosity (when model_type='EVOL' & file_format='OSC')