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Testing the Models Against Observations

Published online by Cambridge University Press:  12 April 2016

Takashi Tsuji
Takashi Tsuji*
Affiliation:
Institute of Astronomy, The University of Tokyo, Mltaka, Tokyo, 181 Japan

Abstract

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Tests of the model atmospheres of red giant stars by photometric observations and angular diameter measurements (including limb-darkening) revealed that the present models reasonably represent the thermal structure of the continuum-forming region of red giant atmospheres. On the other hand, tests by line spectra (including line-blanketed fluxes) revealed that classical model atmospheres of red giant stars cannot yet satisfactorily represent the line-forming region. Recent progress in observations also provide some tests of improved models incorporating non-LTE or sphericity effects. More importantly, recent observations offer the means to test some new approaches such as: hydrodynamical simulation of photospheric convection, modeling atmospheres with thermal bifurcation, and incorporating the effects of outer atmosphere having inhomogeneous structure consisting of warm chromosphere and cool molecular dissociation zone.

Type
2. Model Photospheres and Chemical Compositions
Information
International Astronomical Union Colloquium , Volume 106: Evolution of Peculiar Red Giant Stars , 1989 , pp. 81 - 100
Copyright
Copyright © Cambridge University Press 1989

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