Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..251s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 251-261. Research supported by the Deutsche Forschu
Astronomy and Astrophysics
Astrophysics
45
Abundance, Giant Stars, M Stars, Photosphere, Stellar Atmospheres, Stellar Models, Stellar Spectra, Hydrostatics, Late Stars, Metallicity, Stratification, Thermodynamic Equilibrium
Scientific paper
Extended model photospheres in hydrostatic equilibrium have been computed for M type giants with effective temperatures 3800K ≥ Teff ≥ 2500K. Surface gravities gs range from 0.1 to 6 cm s-2, and photospheric extensions d range from plane-parallel stratifications to more than 50% corresponding to different mass-luminosity combinations. Solar, metal-rich and metal-poor compositions are considered as well as modifications of CNO abundances representing dredge-up of processed material. The properties of the models and their spectra are discussed. Various narrow band color indices are tested as indicators of Teff, gs and d. Metal abundance variations as small as a factor of 3 seriously affect most color indices whereas CNO abundance modifications are hardly detectable. Wavelength dependent radius determinations are briefly discussed.
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