Ionization and excitation in cool giant stars. I - Hydrogen and helium

Details Ionization and excitation in cool giant stars. I - Hydrogen and helium Ionization and excitation in cool giant stars. I - Hydrogen and helium

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..579l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 579-594. Research supported by Indiana University.

Astronomy and Astrophysics

Astrophysics

17

Cool Stars, Gas Ionization, Giant Stars, Helium Hydrogen Atmospheres, Radiative Transfer, Stellar Atmospheres, Electron Density (Concentration), Late Stars, Nonequilibrium Thermodynamics, Red Giant Stars

Scientific paper

The influence that non-LTE radiative transfer has on the electron density, ionization equilibrium, and excitation equilibrium in model atmospheres representative of both oxygen-rich and carbon-rich red giant stars is demonstrated. The radiative transfer and statistical equilibrium equations are solved self-consistently for H, H(-), H2, He I, C I, C II, Na I, Mg I, Mg II, Ca I, and Ca II in a plane-parallel static medium. Calculations are made for both radiative-equilibrium model photospheres alone and model photospheres with attached chromospheric models as determined semiempirically with IUE spectra of g Her (M6 III) and TX Psc (C6, 2). The excitation and ionization results for hydrogen and helium are reported.

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