Other
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..441s&link_type=abstract
(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st
Other
3
Comet Heads, Satellite-Borne Instruments, Spectroscopic Telescopes, Stellar Occultation, Ultraviolet Absorption, Water, Carbon Monoxide, Comet Nuclei, Halley'S Comet, High Resolution, Hot Stars, Hydroxyl Emission, Resonance Lines, Time Dependence, Comets, Ultraviolet, Wavelengths, Absorption, Water, Comae, Equipment, Spectrometers, Telescopic Observations, Occultations, Molecules, Oxygen, Models, Density, Hydroxyl Ions, Carbon Monoxide, Carbon, Time Dependency, Distance, Production Rate, Statistical Analysi
Scientific paper
It is noted that ultraviolet absorption by H2O and other species in the comae of comets could be detected by studying, with satellite telescope-spectrometers, the occultation of hot stars by comets. Observations of this type could produce the first detection of H2O, the fundamental parent molecule in comet comae, and give measures of molecular level populations. The capabilities of the High Resolution Spectrograph on Space Telescope, the first instrument suitable for such observations, are discussed. A Haser model is used to estimate the molecular column densities and to predict equivalent widths for lines of H2O, OH, CO, C, and O as functions of time and angular distance from a comet with a high H2O production rate. The minimum detectable equivalent widths are determined, thereby giving the maximum angular separation from such a comet at which H2O, OH, and CO could be studied. Estimated equivalent widths for CO, OH, and the resonance lines of C and O suggest that these species may also be detected.
Black John Harry
Oppenheimer Michael
Smith Paul L.
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