Abstract
view Abstract Citations (14) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Center-to-limb behavior of first-overtone vibration-rotation transitions of solar carbon monoxide. Ayres, T. R. Abstract High-spectral-resolution measurements of the center-to-limb behavior of weak transitions in the carbon monoxide first-overtone (A V = 2) vibration-rotation bands (w 4300 cm -`) are compared with synthetic line widths and equivalent widths for a range of single-component and multicomponent models of the solar photosphere. The single-component thermal structure in best quantitative agreement with the observed properties of the solar CO spectrum is similar to the Vernazza, Avrett, and Loeser model M. Multicomponent models consisting of Gaussian- distributed temperature perturbations around the best-fit model do not significantly affect the computed center-to-limb behavior of CO lines or the solar carbon abundance derived from measured disk-center equivalent widths. The equivalent width ratios of low- and high-excitation lines within a given vibration-rotation band are found to be inconsistent with "hot" upperphotosphere models, such as the Linsky and Ayres and Holweger and semiempirical single-component models, as well as with the two-stream thermal structure proposed by Tsuji. Excitation ratios and center-to-limb behavior of CO lines require a solar carbon abundance near 3 x 10- for an assumed oxygen abundance of 7 x 10- . This value is consistent with carbon abundances obtained by Tsuji (CO) and Mount and Linsky (CN), but is much smaller than the revised solar carbon abundance recommended recently by Lambert. Subject headings: molecular processes - Sun: abundances - Sun: atmosphere - Sun: spectra Publication: The Astrophysical Journal Pub Date: October 1978 DOI: 10.1086/156527 Bibcode: 1978ApJ...225..665A Keywords: Carbon Monoxide; Molecular Rotation; Solar Atmosphere; Solar Spectra; Abundance; Astronomical Models; Doppler Effect; Solar Physics; Carbon Monoxide:Solar Atmosphere full text sources ADS |
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