Fourier Transform Spectrometer observations of solar carbon monoxide. I - The fundamental and first overtone bands in the quiet sun

Details Fourier Transform Spectrometer observations of solar carbon monoxide. I - The fundamental and first overtone bands in the quiet sun Fourier Transform Spectrometer observations of solar carbon monoxide. I - The fundamental and first overtone bands in the quiet sun

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245.1124a&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, May 1, 1981, p. 1124-1140.

Astronomy and Astrophysics

Astrophysics

103

Carbon Monoxide, Molecular Spectra, Solar Atmosphere, Solar Spectra, Brightness Temperature, Chromosphere, Fourier Transformation, Molecular Rotation, Spectral Bands

Scientific paper

Measurements of the 2200/cm fundamental and 4300/cm first overtone vibration-rotation band systems of solar carbon monoxide, were obtained with the Fourier Transform Spectrometer of the McMath telescope at Kitt Peak. The overtone measurements were taken at the east, north, and west heliocentric limbs, and at disk center. Observations of the strong fundamental bands were obtained at disk center and near the north limb. The low core brightness temperatures of the strongest fundamental carbon monoxide lines near the limb, reported previously by Noyes (1972) and Hall (1974), are confirmed. The possibility that thermal inhomogeneities might be responsible for the unusual behavior of the fundamental carbon dioxide lines have been examined. The somewhat discordant behavior of the fundamental lines at disk center compared with the north limb seems to favor a limb shadowing effect. The first overtone limb equivalent widths and the best-fit thermal and microvelocity models indicate a solar carbon abundance of 0.004 (on the scale with AH = 1) for an oxygen-to-carbon abundance ratio of 2.

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