Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...9981101d&link_type=abstract
Technical Report, NASA Ames Research Center Moffett Field, CA United States
Physics
Interstellar Matter, Star Formation, Early Stars, Protostars, Condensing, Stellar Composition, Stellar Physics, Abundance, Methyl Alcohol
Scientific paper
In protostellar cores where the dust temperature has been raised above 100K and subsequently allowed to fall below the condensation temperature of methanol, recondensation on to cooling grains removes methanol molecules from the gas at rates.faster (about 1000 times) than those of chemical reactions. Molecular recondensation can have a profound effect on the chemical composition of hot cores. The methanol chemistry of hot cores is solved analytically and the trend in molecule binding energies required is compared with theoretical and experimental values. It is demonstrated, through a model calculation incorporating recondensation, that it yields a consistent explanation of the similarity of the CH3OH , CH3OCH3 and HCOOCH3 abundances measured in G34.3 and W3(H2O). These observations suggest that the latter molecules could not be derived from CH3OH through gas phase reactions. The manner in which molecular recondensation could affect the interpretation of hot core chemistry in general, particularly of organic molecules, is briefly discussed.
Charnley Steven B.
Depater Imke
Hollenbach David J.
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