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Title:
Isotopic abundances in interstellar carbon monosulfide
Authors:
Wilson, R. W.; Penzias, A. A.; Wannier, P. G.; Linke, R. A.
Affiliation:
AA(Bell Telephone Laboratories, Inc., Holmdel, N.J.), AB(Bell Telephone Laboratories, Inc., Holmdel, N.J.), AC(Bell Telephone Laboratories, Inc., Holmdel, N.J.), AD(Bell Telephone Laboratories, Inc., Holmdel, N.J.)
Publication:
Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 2, p. L135-L137. (ApJL Homepage)
Publication Date:
03/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Carbon Compounds, Interstellar Matter, Sulfides, Sulfur Isotopes, Data Reduction, Emission Spectra, Line Spectra, Molecular Rotation
DOI:
10.1086/182072
Bibliographic Code:
1976ApJ...204L.135W

Abstract

Results are reported for measurements of the relative isotopic abundances of carbon and sulfur in interstellar carbon monosulfide, which were made by observing the 2-mm rotational-line emission from (C-13)(S-32) and (C-12)(S-34) in five dense interstellar clouds: Sgr B, W51, Orion A, M17, and NGC 2264. For each cloud, the (C-13)(S-32)/(C-12)(S-34) intensity ratio is derived at the 3-sigma level by integrating over the velocity range where the (C-12)(S-34) intensity is greater than half its peak value. All the intensity ratios are found to be larger than the terrestrial abundance ratio, but measurements of the (C-12)(S-33)/(C-12)(S-34) intensity ratio in Sgr B and Orion A are not found to be significantly different from the terrestrial value. It is concluded that the data seem to indicate a source-to-source variation of the relative isotopic abundance in CS, and that the results are consistent with an approximately terrestrial value for the interstellar sulfur isotopic abundance ratios and a greater than terrestrial, although variable, abundance of C-13 relative to C-12.

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