Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240...65f&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Aug. 15, 1980, p. 65-73.
Astronomy and Astrophysics
Astrophysics
42
Abundance, Carbon Isotopes, Chemical Evolution, Interstellar Matter, Milky Way Galaxy, Molecular Clouds, Sulfur Isotopes, Carbon Compounds, Galactic Structure, Line Spectra, Position (Location), Ratios, Sulfides, Tables (Data)
Scientific paper
A survey of the relative abundances of the isotopic species, (C-12)(S-32), (C-12)(S-34), and (C-13)(S-32) has been made in 14 dense molecular clouds through observations of the J = 2-1 rotational transitions at 3 mm. The abundance ratio, (C-13)(S-32)/(C-12)(S-34), is found to be 1.9 times greater in the galactic center sources than in the galactic disk sources. The average ratio for the galactic disk sources is 0.35 + or - 0.10 where the quoted error is the rms of the source-to-source fluctuations. The average disk value for C-13/C-12 is 0.015, if S-32/S-34 is terrestrial. No evidence is found for a systematic variation of the ratio within the disk itself.
Frerking Margaret A.
Linke Richard A.
Wannier Peter G.
Wilson Richard W.
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