Millimetre observations of three southern carbon stars, IRAS 07454-7112, IRAS 15082-4808 and IRAS 15194-5115 detected 14 molecular species and some of their isotopomers. The12C/13C ratio was found to vary between sources.
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Nyman, L.-Å., Olofsson, H., Johansson, L.E.B., Booth, R.S., Carlström, U., Wolstencroft, R.,: 1993,A&A 269, 377.
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Nyman, L.-., Olofsson, H. Molecular abundances in carbon-rich circumstellar envelopes. Astrophys Space Sci 224, 527–528 (1995). https://doi.org/10.1007/BF00667938
- stars: carbon