Time-dependent Fluorescent Processes Of CH Investigated With High-resolution Spectra Of Comets

Details Time-dependent Fluorescent Processes Of CH Investigated With High-resolution Spectra Of Comets Time-dependent Fluorescent Processes Of CH Investigated With High-resolution Spectra Of Comets

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5302k&link_type=abstract

American Astronomical Society, DPS meeting #39, #53.02; Bulletin of the American Astronomical Society, Vol. 39, p.520

Astronomy and Astrophysics

Astronomy

Scientific paper

CH molecules in comets have short lifetimes against dissociations by solar ultraviolet radiation. Short lifetime molecules do not achieve fluorescent equilibrium during their lifetimes in comets. Although one can use the fluorescent equilibrium approximation for many cases, time-dependent calculations are often necessary to analyze cometary spectra for short lifetime molecules. We have updated time-dependent fluorescence of the A-X and B-X bands of CH. We applied the new models to high resolution spectra of comet Machholz (C/2004 Q2), which was observed with optical echelle spectrograph (BOES) on the 1.8-m telescope at Bohyunsan Observatory, Korea, with a spectral resolving power of 30,000 on January 4, 2005 (UT). We also applied the time-dependent models to spectra of previous comets, such as Hyakutake (C/1996 B2), and Austin (1990V). We will present detailed time-dependent excitation processes of the CH bands, and discuss the influence of the time-dependent models on the derivations of CH abundances in comets.

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