Astronomical and laboratory study of Si(C-13)C

Details Astronomical and laboratory study of Si(C-13)C Astronomical and laboratory study of Si(C-13)C

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..213c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 213-220.

Astronomy and Astrophysics

Astrophysics

31

Carbon Stars, Line Spectra, Silicon Carbides, Stellar Composition, Stellar Envelopes, Stellar Spectrophotometry, Carbon 12, Carbon 13, Microwave Spectra, Signal To Noise Ratios

Scientific paper

The present study identifies 13-mm lines of Si(C-13)C in the spectrum of the carbon-rich circumstellar envelope IRC + 10216 and 48-submillimeter lines in a microwave laboratory. The spectroscopic constants of this isotopomer, as well as the precise geometry of SiC2, are derived. The astronomical observations yield an accurate value of the C-13 isotopic abundance, whereas the analysis of the rotational constants of all monosubstituted isotopomers allow a substitution structure to be derived for this ring molecule. The structure is compared with the equilibrium structure determined by ab initio calculations. The C-12/C-13 abundance ratios derived for SiCC and CS agree within a rather small error margin, which supports the contention that neither of these species is significantly affected by isotopic fractionation.

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