KIS Solar Evolution Code

The solar evolution code at the KIS is an evolved version of the Hofmeister et.al. stellar evolution code (see Hofmeister, E., Kippenhahn, R., Weigert, A.: Z.f.Aph.59, p.215-241,1964; Kippenhahn, R., Weigert, A., Hofmeister, E., Methods in Comp. Phys.7,p.129-191, 1967). It consists of approximately fifty Fortran 90 or Fortran 77 subroutines. The code is currently able to follow low mass evolution (< 3 solar masses, < 14 solar radii) up to (but not covering) the helium flash , but has several restrictions.

Last major revision: 5 February 98     ---     Plans for next revisions

The following physical ingredients are implemented:

• Opacity Tables:
  • Los Alamos Kurucz

  • LAOL Weiss 89

  • OPAL 92

  • OPAL 95 + Alexander

• Equation of State:
  • partial Ionization, Degeneracy, Electrostatic Correction (see Stix & Skaley)

  • MHD tables

  • OPAL 95 tables

• Convection:
  • local mixing length / artificial overshoot

  • local Canuto-Mazzitelli formulation (1991/92 and 1996)

  • nonlocal integration with overshoot (see Skaley & Stix,   Shaviv & Salpeter)

• Energy and Element Production
  • gravitational energy release

  • hydrogen burning in equilibrium

  • equilibrium / nonequilibrium CNO cycle

  • lithium / beryllium reaction chains

  • neutrino fluxes (see also John Bahcall's excellent neutrino viewgraphs)

• Diffusion
  • hydrogen and helium diffusion (see Thoul et al.)

A map of the program.

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