On the instability parameters of stellar atmospheres

Details On the instability parameters of stellar atmospheres On the instability parameters of stellar atmospheres

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..147l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 147-152.

Statistics

Computation

13

Stellar Atmospheres, Stellar Models, Supergiant Stars, Abundance, Adiabatic Conditions, Computational Astrophysics, Gas Mixtures, Interstellar Chemistry, Shock Waves

Scientific paper

We discuss the significance of the adiabatic exponents Gamma1, Gamma2, and Gamma3 and derive expressions for their calculation in a stellar atmosphere including simultaneous single-ionization of various elements and the presence of an equilibrium radiation field. A discussion is given of the relation of Gamma1 to dynamic instability. It is shown that some parts of some Kurucz models for extreme supergiant atmosphere are dynamically instable as a result of ionization and radiation in the deeper layers.

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