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The Astrophysical Journal

Article . 1976 . Peer-reviewed

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The Astrophysical Journal

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Molecular ions in comet tails

descriptionPublicationkeyboard_double_arrow_right Article 01 Mar 1976 English Publisher:American Astronomical SocietyJournal:The Astrophysical Journal, volume 204, page 604 (issn: 0004-637X, eissn: 1538-4357,

Authors: P. A. Wehinger; S. Wyckoff;

doi: 10.1086/154209

Molecular ions in comet tails

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Abstract

Band intensities of the molecular ions CH/sup +/, CO/sup +/, N/sub 2//sup +/, and H/sub 2/O/sup +/ have been determined on an absolute scale from tail spectra of comet Kohoutek (1973f) and comet Bradfield (1974b). Photoionization and photodissociation rates have been computed for CH, CO, and N/sub 2/. Also emission rate excitation g-factors for (1) photoionization plus excitation and (2) resonance fluorescence have been computed for the observed ions. It is shown that resonance fluorescence is the dominant excitation mechanism for observed comet tail ions at rapprox. =1 AU. Band system luminosities and molecular ion abundances within a projected nuclear distance rho<10/sup 4/ km have been determined for CH/sup +/, CO/sup +/, N/sub 2//sup +/, and H/sub 2/O/sup +/ in comet Kohoutek, and for H/sub 2/O/sup +/ in comet Bradfield. Estimates are also given for column densities of all observed ions at rhoapprox. =10/sup 4/ km on the tailward side of the coma. The observed H/sub 2/O/sup +/ column densities were found to be roughly the same in comet Kohoutek and comet Bradfield et equal heliocentric distances, while CO/sup +/ was found to be approximately 100 times more abundant than H/sub 2/O/sup +/, N/sub 2//sup +/, and CH/sup +/ atmore » rhoapprox. =10/sup 4/ km in comet Kohoutek. Finally, the relative abundances of the observed ions and of the presumed parent neutral species are briefly discussed. (AIP)« less

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