Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..886c&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb, 1, 1980, p. 886-888.
Astronomy and Astrophysics
Astronomy
19
Carbon Monoxide, Hydrocarbons, Infrared Astronomy, Interstellar Matter, Line Spectra, Molecular Spectra, High Frequencies, Infrared Spectra, Radio Sources (Astronomy), Stellar Envelopes, Vibrational Spectra
Scientific paper
The identification of the 114,221-MHz line in the spectrum of the evolved carbon star IRC +10216 with a blend of the rotational transition of C4H and the first rotational transition of vibrationally excited CO is investigated. A spectrum of the source was obtained using an 11-m telescope in the range covering the N = 12 to 11 and 11 to 10 spin-doublet rotational transitions of C4H. Two peaks of equal intensity and width are found in each band, suggesting a spin rotation constant of 1.06 for the 12 to 11 doublet and 1.09 for the 11 to 10 doublet, and excluding the possibility that vibrationally excited CO made any contribution to the 12 to 11 doublet. An additional survey of the regions from 103.8 to 107.5 and 113.3 to 117.0 GHz has revealed no new lines stronger than 0.1 K in the spectrum of IRC +10216.
Cummins S. E.
Morris Marita
Thaddeus Patrick
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