Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.249..135c&link_type=abstract
In ESA Proceedings of an ESA Workshop on the Comet Nucleus Sample Return Mission p 135-142 (SEE N87-25109 18-90)
Astronomy and Astrophysics
Astronomy
Aluminum, Comet Nuclei, Cosmochemistry, Evolution (Development), Interstellar Matter, Volatility, Astronomical Models, Interstellar Gas, Isotopes, Solar System
Scientific paper
It is shown that the distribution of refractory metals in a comet-nucleus drill core carries a chemical memory quite distinct from that of volatiles. Using aluminum as an example, it is demonstrated that very refractory structures, either grain cores or refractory aggregates of cores, must be much older than the volatile component. It is argued that isotopic anomalies are specifically associated with aluminum. An evolutionary model capable of rationalizing the interstellar gas depletions of Al and Mg is advocated. The distribution of Al in comets is shown to be crucial to understanding the origin of comets and of the solar system.
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