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We have identified 139 cool carbon stars in the near‐infrared spectrophotometric survey of the Infrared Telescope in Space ( IRTS ) from the conspicuous presence of molecular absorption bands at 1.8, 3.1, and 3.8 μm. Among them, 14 are new bright (K∼4.0–7.0) carbon stars. We find a trend relating the 3.1 μm band strength to the K - L ' color index, which is known to correlate with mass‐loss rate. This could be an effect of a relation between the depth of the 3.1 μm feature and the degree of development of the extended stellar atmosphere where dust starts to form.
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Bertre et al. (2005) studied this question.
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