Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..553w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 553-590. Research sponsored by the Deutsche Forschung
Astronomy and Astrophysics
Astronomy
31
Abundance, Atmospheric Stratification, M Stars, Stellar Atmospheres, Stellar Temperature, Supergiant Stars, Carbon, Gas Pressure, Heavy Elements, Nitrogen, Oxygen, Partial Pressure, Red Giant Stars, Spectrum Analysis, Stellar Models
Scientific paper
Constructed models show that the stratifications of M type giants and supergiants are mainly determined by the abundance of CNO in the outer layers, whereas in the inner parts the electron-donating heavy metals are most important. Between these regions there is a zone of low absorption, where scattering processes prevail. As a consequence of the temperature and pressure relations near the surface, large changes in the partial pressures and in the total gas pressure for only moderate changes in the abundances are found in the models. The changes are partly due to direct effects (change of the equation of state, opacity) and partly due to indirect effects, which occur in connection with changes in the geometrical extension or as a consequence of changes in temperature stratifications.
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