Homogeneous models represent uniform-density stars in hydrostatic equilibrium; they are equivalent to polytropes with index \(\npoly=0\). Because their structure can be calculated analytically, GYRE creates them on-the-fly without the need to read from an external file.
To use a homogeneous model with GYRE, set the
parameter in the
&model namelist group to
grid_type parameters to suitable values (see the
Stellar Model Parameters section for more details).