Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.3207r&link_type=abstract
American Astronomical Society, DPS meeting #31, #32.07
Astronomy and Astrophysics
Astronomy
Scientific paper
High-resolution spectra of comets Hyakutake and Hale-Bopp provide a unique opportunity to advance our knowledge of parent species in comets. To interpret these observations, a detailed model that combines time-dependent fluorescence calculations with a global coma model based on gas dynamics and chemistry has been developed. Due to the short lifetime of S_2, it is concentrated in the innermost region of the coma where dynamics and chemistry are most important. S_2 was first discovered in Comet Iras-Araki-Alcock in 1983 and also in Comet Hyakutake in 1996. Using this versatile model, a systematic study of the vibrational-rotational spectrum of S_2 is undertaken, including relevant effects, such as, non-equilibrium state superposition, the Swings effect, and the number density profile within the coma due to dynamics and chemistry. Synthetic fluorescence spectra of S_2 are calculated as a function of time after release from the nucleus to investigate the importance of the above effects on the scale length and abundance of S_2 in comets. Support for this work was provided by NSF and the visiting researcher program of the Université de Franche-Comté.
Boice Daniel C.
Reyle Céline
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