Changes in the C_2 Spectrum of Comets Hyakutake and Hale-Bopp

Details Changes in the C_2 Spectrum of Comets Hyakutake and Hale-Bopp Changes in the C_2 Spectrum of Comets Hyakutake and Hale-Bopp

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0928r&link_type=abstract

American Astronomical Society, DPS meeting #28, #09.28; Bulletin of the American Astronomical Society, Vol. 28, p.1093

Astronomy and Astrophysics

Astronomy

Scientific paper

The Swan bands of the C_2 molecules, located at 513 and 516 nm can be used as a tracer of the C_2 excitation temperature in a cometary coma. The ratio of the signal obtained at these two wavelengths (I(513)/I(516)), after subtraction of the continuum, is correlated with the rotational excitation temperature : the higher the ratio is, the higher the excitation temperature is. We used the 1.93-m telescope of the Observatoire de Haute-Provence (France) with a spectrometer and the 1.20-m telescope in imaging mode (with interference filters). The variation of the C_2 excitation temperature is shown for Comets Hyakutake and Hale-Bopp. The results reveal some significant changes in this parameter, mainly with the cometocentric distance, interpreted as "fresh" C_2 molecules reaching slowly their fluorescence equilibrium. The results obtained with these Comets confirm those already obtained in Halley's Comet ( Rousselot et al., A&A 1994) and Comets P/Tempel 2 and P/Schaumasse (Rousselot at al., Icarus 1995).

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