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Equation of state for solar modeling

Equation of state for solar modeling

On this page you can compute thermodynamics for conditions which exist inside the Sun. Different equations of state tables can be used, including SAHA-S equation of state.

Select equation of state [help]

Equation of state:

Select output values [help]

Pressure P, dyn/cm^2
Reduced pressure PI = P/(T*rho)
Logarithmic partial derivative dlogP/dlogT (hi_t)
Logarithmic partial derivative dlogP/dlogRHO (hi_rho)
Logarithmic partial derivative dlogP/dlogX (hi_x)
Expansion coefficient Q
Specific internal energy U, erg/g
Specific heat at constant volume Cv
Specific heat at constant pressure Cp
Logarithmic partial derivative dlogU/dlogRHO (ksi_rho)
Adiabatic exponent Gamma3 (G3)
Adiabatic gradient (nabla)
Adiabatic exponent Gamma1 (G1)
Sound speed, cm/sec (cs)

If you do not select anything, pressure will still be printed.

Enter input data [help]

Enter here temperature T, density rho and chemical composition, one set of values per line (multiple lines are allowed). Chemical composition can be entered in four possible ways:

1) separate input fields for X and Z are used, each line contains only T and rho; example:

2.17e6 0.18

2) each line contains T, rho, X and Z; separate input fields for X and Z are ignored; example:

2.17e6 0.18 0.74 0.018

3) each line contains T, rho, X, Z(CNO), Z(Ne), Z(FeSi); separate input fields for X and Z are ignored; example:

2.17e6 0.18 0.74 0.010 0.002 0.006

4) each line contains T, rho, X and 19 components for Z (C, N, O, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Ti, Cr, Mn, Fe, Ni); separate input fields for X and Z are ignored (this format is not very useful currently)

It is possible but not recommended to mix different numbers of Z components in one job. Input field size does not limit the amount of data entered; you can type or paste thousands of lines (10,000 lines tested with output size over 5MB).

Hydrogen mass fraction X (0.0 - 0.9):

Heavy elements mass fraction Z (0.0 - 0.02):

    EOS tables may take up to 20 seconds to load! Please be patient...

Start over with clean input form.


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