Expected and observed profiles of CO and CS in cometary spectra

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Carbon Compounds, Carbon Monoxide, Comets, Molecular Spectra, Spectral Bands, Fluorescence, Molecular Rotation, Sulfides, West Comet

Scientific paper

Rotational profiles for (A-X) bands of CO (at 1500 A) and CS (at 2575 A) are determined theoretically and compared to those observed in comets. The population distributions of various rotational levels are obtained by solving the statistical equilibrium equations describing the resonance fluorescence process and combined with known vibrational populations to compute the rotational profiles by the method of Arpigny (1966). The results are presented graphically and compared to observations of CO in comet West (Feldman and Brune, 1976) and CS in comet Bradfield (Jackson et al., 1980, 1982): good agreement is found.

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