Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..311k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 311-317.
Astronomy and Astrophysics
Astronomy
41
Atmospheric Temperature, Chromosphere, Late Stars, Magnetohydrodynamic Stability, Radiative Transfer, Carbon Monoxide, Infrared Astronomy, Molecular Rotation, Sunspots, Thermodynamic Equilibrium
Scientific paper
IR vibration-rotation bands of CO are noted to cause a radiative instability due to the extreme temperature sensitivity of molecule formation, in the course of an attempt to construct stellar atmospheres which are in radiative equilibrium for the case of a T(eff) of 5800 K, which approximates the T(eff) of the sun. It is accordingly suggested that such stellar atmospheres, in principle, may not exist. CO molecule-based arguments can be extended to other molecular species which should destabilize the atmospheres of cooler stars. This implies that, for the sun, the instability occurs at the mass column density of the temperature minimum deduced from observations. For sunspot chromospheres, the predicted critical mass column density agrees with that of the onset of the chromospheric temperature rise in current sunspot models. It is further suggested that the chromospheres of late-type stars are produced inevitably, and that their seed is located at their base.
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