Anomalous molecular abundances and the depletion of NH2 in Comet P/Giacobini-Zinner

Details Anomalous molecular abundances and the depletion of NH2 in Comet P/Giacobini-Zinner Anomalous molecular abundances and the depletion of NH2 in Comet P/Giacobini-Zinner

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..696b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 696-701.

Astronomy and Astrophysics

Astrophysics

13

Abundance, Giacobini-Zinner Comet, Molecular Ions, Nitrogen Compounds, Astronomical Spectroscopy, Cosmic Dust, Interstellar Gas

Scientific paper

Observations of the CN, C2, C3, and NH2 molecules in spectra of the Comet P/Giacobini-Zinner (P/G-Z) obtained during the 1985 apparition are presented. Haser-model production rates are derived, and it is found that Q(C2)/Q(CN) and Q(C3)/Q(CN) are low compared to those in normal comets. This indicates that C2 and C3 were underabundance in P/G-Z, in agreement with previous results. Q(NH2)/Q(CN) is determined for five comets for the first time to determine a 'normal' value for this ratio. The ratio for P/G-Z is low compared to the value for the ensemble, suggesting that NH2 was underabundant. For the five-comet sample, Q(C3)/Q(CN) exhibits a strong dependence with heliocentric distance, in contrast to Q(C2)/Q(CN) and Q(C3)/Q(CN). The dust-to-gas ratio is characterized by calculating the product of the dust-grain albedo, the filling factor, and the projected radius of the aperture and by computing the dust-to-gas mass ratio.

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