Titlebook: Composition and Origin of Cometary Materials; Proceedings of an IS K. Altwegg,P. Ehrenfreund,W. F. Huebner Conference proceedings 1999 Spri

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MANOVA und Diskriminanzanalyse,ces: i) comets with a strong silicate emission feature present a high maximum in polarization, ii) the polarization is always slightly lower than the average in inner comae and stronger in jet-like structures. These results are in excellent agreement with the Greenberg model of dust particles built

猛擊

Hauptkomponenten- und Faktoranalyse,ice is presumably amorphous and includes considerable fractions of occluded gases. This structure undergoes significant changes during the early evolution of the nucleus at large heliocentric distances, due to internal radiogenic heating. Structural changes occur mainly as a result of gas flow throu

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Composition and Origin of Cometary Materials978-94-011-4211-3Series ISSN 1385-7525

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,Versuchsplanung und Parametersch?tzung,ndance of more than 10 parent species. The instrument discovered strong extended H.CO and CO sources in the coma of Comet Halley. Polymerized H.CO associated with the cometary dust and evaporating slowly as the monomer is most likely the extended H.CO source. Photodissociation of the H.CO into CO fully accounts for the extended CO source.

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,Versuchspl?ne für komplexe Zusammenh?nge,omponent in the coma, rather than directly from the volatiles in the nucleus. Based on the fluffy aggregate interstellar dust comet model, we have estimated the upper limits of the total amount of CO provided by coma dust. The implications from the comparison of the predicted results with the observed value have been discussed.

PAD416

物種起源

Remote Observations of the Composition of Cometary Volatilesent of their abundances is possible by remote sensing. Considerable progress has been made recently using radio and infrared spectroscopy, especially with the observations of the two exceptional comets C/1996 B2 (Hyakutake) and C/1995 01 (Hale-Bopp).) 24 molecules likely to be parent molecules outga

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Cometary Deuteriumevealed the first accurate D/H ratios in the water of Comet 1P/Halley. Ground-based observations of HDO in Comets C/1996 B2 (Hyakutake) and C/1995 01 (Hale-Bopp), the detection of DCN in Comet Hale-Bopp, and upper limits for several other D-bearing molecules complement our limited sample of D/H meas

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On the Existence of Distributed Sources in Comet Comaenon-refractory grains or trapped inside the nucleus “material”. Grains can also be a source of molecules in the coma. Chemical reactions may occur between coma species. Consequently, although chances that an abundant coma species has not been detected are now small, the coma composition is certainly