Computer Science
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.315...27v&link_type=abstract
In ESA, Formation of Stars and Planets, and the Evolution of the Solar System p 27-34 (SEE N91-18922 10-90)
Computer Science
1
Cometary Atmospheres, Cosmochemistry, Interstellar Chemistry, Protostars, Interstellar Matter, Molecular Clouds, Molecular Interactions
Scientific paper
The different processes that can affect the chemical composition of matter as it evolves from quiescent molecular clouds into protostellar regions are discussed. Millimeter observations of molecules at high angular resolution in cold, dark clouds such as TMS-1 and L134N reveal large chemical gradients on scales of a few tenths of a pc, which are not well understood. The abundances of the dominant oxygen (H2O, O2, O), and nitrogen (N, N2) bearing species are ill determined both observationally and theoretically, and little is known about some important carbon bearing molecules such as CH4, CO2 and C2H2. Observations of the distribution of molecular material in disks surrounding newly formed low mass stars such as IRAS 16293-2422 are presented. They reveal a complex chemistry observed in the high mass star forming region Orion/KL, despite a factor of 1000 difference in stellar luminosity. A brief comparison with the chemical composition of comets is made.
Blake Geoffrey A.
Mundy Lee G.
van Dishoeck Ewine F.
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