Carbon stable isotopes in comets after encounters with P/Halley

Details Carbon stable isotopes in comets after encounters with P/Halley Carbon stable isotopes in comets after encounters with P/Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.373s&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 373-376 (SEE N87

Physics

1

Carbon 12, Carbon 13, Halley'S Comet, Ratios, Abundance, Refractory Materials, Swan Bands, Volatility

Scientific paper

The only isotopes identified in comets from ground-based observations are the stable carbon isotopes. Although the determination from C2 and CN emission is not precise the ratio 12C/13C tends to be equal or higher than the terrestrial value 89, but may not be representative for cometary solid grains. The selection of 38 PUMA 1/mode O/mass spectra with prominent 12 amu peaks shows surprisingly variable 12/13 amu signal ratio within 3 decades. If corrected for possible instrumental effects and contamination, the gross carbon isotopic data for P/Halley may suggest some 12C enrichment both in the volatile and refractory materials relatively to the Solar System carbon isotopic ratio.

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