The heliocentric evolution of cometary infrared spectra - Results from an organic grain model

Details The heliocentric evolution of cometary infrared spectra - Results from an organic grain model The heliocentric evolution of cometary infrared spectra - Results from an organic grain model

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...79..362c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 79, June 1989, p. 362-381.

Astronomy and Astrophysics

Astronomy

28

Astronomical Models, Halley'S Comet, Infrared Spectra, Interplanetary Dust, Organic Compounds, Continuous Spectra, Distance, Grains, Hydrocarbons, Near Infrared Radiation, Optical Thickness, Comets, Spectra, Evolution, Infrared, Wavelengths, Organic Material, Models, Comparisons, Emissions, Thermal Properties, Halley, Wilson, Grains, Comae, Spacecraft Observations, Calculations, Distance, Gases, Earth-Based Observations, Composition, Fluorescence, Aircraft Observations

Scientific paper

An emission feature peaking near 3.4 microns that is typical of C-H stretching in hydrocarbons and which fits a simple, two-component thermal emission model for dust in the cometary coma, has been noted in observations of Comets Halley and Wilson. A noteworthy consequence of this modeling is that, at about 1 AU, emission features at wavelengths longer than 3.4 microns come to be 'diluted' by continuum emission. A quantitative development of the model shows it to agree with observational data for Comet Halley for certain, plausible values of the optical constants; the observed heliocentric evolution of the 3.4-micron feature thereby furnishes information on the composition of the comet's organic grains.

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