Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987umassrept.....i&link_type=abstract
Semiannual Status Report, 16 Aug. 1986 - 15 Feb. 1987 Massachusetts Univ., Amherst. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astronomy
Abundance, Boundary Conditions, Hydrocarbons, Interstellar Chemistry, Molecular Clouds, Star Formation, Chemical Reactions, Emission Spectra, Infrared Spectra, Masers
Scientific paper
Detailed study of the first interstellar hydrocarbon ring, cyclopropenylidene (C3H2), is continuing. The singly deuterated isotope of this molecule, C3HD, was observed in several cold interstellar clouds. The results of a large survey for C3H2 in galactic sources of various types will soon be completed. It appears that cyclopropenylidene is present in virtually all interstellar clouds of at least moderate density. In order to make the first determinations of the CO2/CO abundance ratio in interstellar sources, observations of protonated CO2 were pursued. The spectrum from 18.5 to 22 GHz for several interstellar clouds is being systematically measured. Particular attention is being given to the cold, dark clouds TMC-1 and L124N, which may be formation sites for solar mass stars. The phenomena of maser emission from molecules of methanol is being studied in certain interstellar clouds. A comparison of 1 millimeter continuum emission from dust with the column density of carbon monoxide as determined from the rare C(18)O isotope for 4 molecular clouds in the Galaxy is nearing completion. Papers published during the period of this report are listed.
Irvine William M.
Schloerb Peter F.
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