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- W120796060 abstract "We have extended our data base of collision induced absorption (CIA) in the high-temperature regime applicable to stellar atmospheres. Improvements of existing data include computation of series of hot-bands and extension of the spectral wings much further away from the maxima than hitherto. Com- putation of new bands includes thefirst and the second overtone bands of H2-H2. We apply these data to an extensive grid of oxygen-rich model atmospheres with scaled solar metallicities in order to investigate for which range of fundamental stellar parameters (i.e., effective temperature, gravity, and chemical composition) CIA has a significant impact on the atmospheric structure. Besides the CIA due to H2-H2 and H2-He pairs, our modelsincludecompletemolecularlinedataforTiO,H2O,CN, CH, and SiO. For stellar models with low effective temperatures, high gravity, and low metallicity, the atmospheric structure and the emergent spectrum are completely dominated by the effects of CIA. For our test-models of lowest effective temperature and lowest metallicity (Teff = 2800K an dZ=1 0 3 Z �) the effect of CIA is pronounced even for sub-giant stars with log(g) = 2.0. For dwarf models wit hZ=1 0 3 Zand log(g) = 5.0 the effects are visible in the overall flux distribution for effective temper- atures as high as 4000K, and for models with Teff = 2800K and log(g) = 5.0 CIA has effects on the spectrum of stars with metallicities as high as 0.1Z�." @default.
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- W120796060 date "1997-08-01" @default.
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- W120796060 title "Model atmospheres of cool, low-metallicity stars: the importance of collision-induced absorption" @default.
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