The C-12/C-13 abundance ratio in Comet Halley

Details The C-12/C-13 abundance ratio in Comet Halley The C-12/C-13 abundance ratio in Comet Halley

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..488w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 1, 1989, p. 488-500. Research supported by NSF, U.S.-Australian

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29

Abundance, Carbon Isotopes, Halley'S Comet, Line Spectra, Oort Cloud, Chemical Evolution, High Resolution, Interstellar Matter, Solar System, Comets, Halley, Isotopic Ratios, Abundance, Carbon, Spectra, Origin, Enrichment, Depletion, Source, Oort Cloud, Condensation, Formation, Hypotheses, Earth-Based Observations, Comparisons, Capture, Fractionation, Contamination, Position (Location)

Scientific paper

The individual (C-13)N rotational lines in Comet Halley are resolved using high-resolution spectra of the CN B2Sigma(+)-X2Sigma(+) (0,0) band. The observe C-12/C-13 abundance ratio excludes a site of origin for the comet near Uranus and Neptune and suggests a condensation environment quite distinct from other solar system bodies. Two theories are presented for the origin of Comet Halley. One theory suggest that the comet originated 4.5 Gyr ago in an inner Oort cloud at a heliocentric distance greater than 100 AU where chemical fractionation led to the C-13 enrichment in the CN parent molecule prior to condensation of the comet nucleus. According to the other, more plausible theory, the comet nucleus condensed relatively recently from the interstellar medium which has become enriches in C-13 and was subsequently gravitationally captured by the solar system.

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