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Ionization and excitation in cool giant stars. I - Hydrogen and heliumThe 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.
Document ID
19920050407
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Luttermoser, Donald G.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Johnson, Hollis R.
(Indiana University Bloomington, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 388
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A33031
Funding Number(s)
CONTRACT_GRANT: NSF AST-85-20539
CONTRACT_GRANT: NAG5-182
CONTRACT_GRANT: NAG5-1305
Distribution Limits
Public
Copyright
Other

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