Millimetre observations of IRAS selected red carbon stars are presented. About 260 stars have been observed with SEST and IRAM in the CO (1–0) and CO (2–1) lines and partially in HCN (1–0) and SiO (3–2). An overall detection rate, in at least one line, of about 80% is achieved. The survey represents the second largest survey for AGB stars, and the largest ever for carbon stars. Two new detections in SiO (3–2) in carbon stars are reported. When available, the SiO/HCN and HCN/CO (1–0) line ratios are consistent with the ratios expected for carbon stars.
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Groenewegen et al. (2002) studied this question.