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Title:
Ion abundances and implications for photochemistry in Comets Halley (1986 III) and Bradfield (1987 XXIX)
Authors:
Lutz, B. L.; Womack, M.; Wagner, R. M.
Affiliation:
AA(Northern Arizona Univ., Flagstaff, AZ), AB(Northern Arizona Univ., Flagstaff, AZ), AC(Ohio State Univ., Columbus)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 402-411. (ApJ Homepage)
Publication Date:
04/1993
Category:
Astrophysics; Comets
Origin:
STI; LPI [AN-930241%J]
NASA/STI Keywords:
ABUNDANCE, COMET TAILS, HALLEY'S COMET, IONIC REACTIONS, PHOTOCHEMICAL REACTIONS, ASTRONOMICAL SPECTROSCOPY, FLUORESCENCE, PHOTOIONIZATION
LPI Keywords:
COMETS, HALLEY, IONS, ABUNDANCE, PHOTOCHEMISTRY, BRADFIELD, NITROGEN, COMET TAILS, SPECTROSCOPY, SPECTRA, EARTH-BASED OBSERVATIONS, WATER, FLUX, DENSITY, CARBON MONOXIDE, PHOTOIONIZATION, ELEMENT RATIOS, DATA, COMPARISONS, FLUORESCENCE, MOLECULAR PROCESSES, SPACECRAFT OBSERVATIONS, GIOTTO MISSION, IMS INSTRUMENT, HERS INSTRUMENT, RPA INSTRUMENT, MODELS, PICCA INSTRUMENT, THEORETICAL STUDIES
DOI:
10.1086/172523
Bibliographic Code:
1993ApJ...407..402L

Abstract

The Ohio State University Image Dissector Scanner on the Perkins 1.8-m telescope at the Lowell Observatory was used to record spectra of the plasma tails of Comets P/Halley (1986 III) and P/Bradfield (1987 XXIX, also 1987s). The ionic species CO(+), N2(+), CH(+), and H2O(+) were identified in these spectra, and column densities for them were calculated from measured fluxes. The observed N2(+)/H2O(+) ratios are at least an order of magnitude lower and the observed CH(+)/H2O(+) ratios are a factor of 100 higher than theoretical results. The abundance ratio N2/CO was derived in the plasma tail of Bradfield from N2(+) and CO(+) data, and found to be an order of magnitude higher than a value measured in Halley. The relative ion abundances of CH(+), N2(+), CO(+), and H2O(+) in Halley are consistent with in situ measurements obtained from the Giotto spacecraft.

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