Analysis of the swings effect and Greenstein effect in Comet P/Halley

Details Analysis of the swings effect and Greenstein effect in Comet P/Halley Analysis of the swings effect and Greenstein effect in Comet P/Halley

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..306j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 10, 1991, p. 306-317.

Astronomy and Astrophysics

Astrophysics

10

Astronomical Spectroscopy, Cyanogen, Emission Spectra, Halley'S Comet, Resonance Fluorescence, Carbon Isotopes, Comet Nuclei, Line Shape

Scientific paper

Spectra have been obtained of Comet P/Halley using the Image Photon Counting System (IPCS) on the Anglo-Australian Telescope in April, 1986. The CN (0,0) violet system is analyzed to demonstrate the Swings resonance-fluorescence mechanism and multiple spectral images are used in an attempt to create a velocity map of the CN gas throughout the coma by application of the Greenstein effect. The theoretical calculations of the Swings effect are found to be in good agreement with the observed intensities of the R-branch lines of Comet P /Halley. This validates the assertion of an optically thin coma. In addition, 13 lines interspersed throughout the R-branch are identified as lines belonging to the (C-12)N (1,1) band and the (C-13)N (0,0) band. The (C-13)N (0,0) isotope (R(7) and R(8) lines are used to obtain the C-12/C-13 ratio in the comet. A value of 89 + or - 17 is found in agreement with the solar value. The Greenstein effect is seen observationally and velocity profiles through the coma are obtained by modeling the R(9)/R(12) ratio of the CN(0,0) band.

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