Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..476o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 476-488. Research supported by the National Academy o
Astronomy and Astrophysics
Astrophysics
31
Carbon, Comet Tails, Halley'S Comet, Light Scattering, Solar Orbits, Chemical Evolution, Giotto Mission, Spectrophotometry, Vega Project
Scientific paper
The authors have used long-slit spectrophotometric observations of Comet Halley on five nights at heliocentric distances of 0.90 - 2.21 AU to determine the surface brightness distribution of the coma in the strongest C2 Swan bands and the scattered light continuum. The C2 observations indicate that C2 must be the product of the decay of two precursors, rather than the one stage of decay previously accepted, or that one of the more complex chemical formation models applies. The authors have obtained the first clear-cut determination of the variation of the C2 band sequence flux ratios with heliocentric distance. Those data indicate that the transition moment of the ground-state single-triplet transitions is 2.5×10-6.
Krishna Swamy K. S.
McCarthy Patrick. J.
O'Dell Charles Robert
Robinson Ronald R.
Spinrad Hyron
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