Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..531s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 531-538.
Astronomy and Astrophysics
Astrophysics
47
Abundance, Astronomical Photometry, Giacobini-Zinner Comet, Molecular Spectra, Carbon, Cyanogen, Hydroxyl Radicals, International Sun Earth Explorer 3, Nitrogen
Scientific paper
Narrowband filter photometry of comet P/Giacobini-Zinner was obtained on 15 nights at Lowell Observatory in the interval from 15 June to 20 November 1985. The emission bands of OH, NH, CN, C3, and C2 were isolated, along with continuum points at 3650 Å and 4845 Å. All observed species showed pronounced asymmetry about perihelion, with pre-perihelion abundances being greater by more than a factor of 2 than post-perihelion abundances over the heliocentric distance range of 1.0 - 1.5 AU. The characteristics of the asymmetry were significantly different than observed in previous apparitions, with the peak production rates occurring in late July/early August. The unusually low C2/CN abundance ratio seen in previous apparitions is confirmed by the present observations. Furthermore, the OH data demonstrate that the C2 in Giacobini-Zinner (along with C3 and NH) is depleted when compared to water (the dominant species), rather than CN being unusually overabundant.
Birch Peter V.
Millis Robert L.
Schleicher David G.
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