Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45...69s&link_type=abstract
Astronomy and Astrophysics, vol. 45, no. 1, Dec. 1975, p. 69-76.
Astronomy and Astrophysics
Astrophysics
34
Infrared Spectra, Line Spectra, Solar Spectra, Sunspots, Umbras, Astronomical Models, Continuous Spectra, Luminous Intensity, Photosphere, Pressure Distribution, Spectral Line Width, Temperature Distribution
Scientific paper
A previously proposed empirical 'working model' of the temperature and pressure stratification in sunspot umbrae is extrapolated to the 1.67-micron IR line originating in the deepest observable umbral layers. Three constraints are placed on the range of possible extrapolations: the continuum near 1.67 microns must not fall below the range of observations, the intensities of the carbon lines at 16,888 A and 17,456 A must not be stronger than the lower observational limit, and the good line-profile representation of the 'working model' must not be distorted. The calculations indicate that a model with an effective temperature of 3750 K and a stratification where the Rosseland opacity is a function of the fourth power of temperature is in full accord with the observations, represents the steepest possible extrapolation of the 'working model', and reflects a strong depth-dependent line blanketing, in contrast to the photosphere. The results also show that convection becomes important in umbrae at considerably greater depths than in the photosphere.
Stellmacher Goetz
Wiehr Eberhard
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