Based on observations obtained with the Very Large Telescope of the European Southern Observatory at Paranal, Chile.

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In addition, we noted a small, but clearly missing absorption component, in the synthesis around 4057.63 Å, bluewards of the CH line in Fig. 1. This feature is too far from the Pb line to affect its abundance, but to check the nature of this unidentified feature, we compared our CS 31082-001 spectrum with the spectra of C-rich stars of similar temperature, gravity, and metallicity, and found that these stars also exhibited absorption missing in the synthesis around 4057.63 Å, with an amplitude clearly linked to the C and N abundances. We therefore conclude that it is a CH or CN molecular line.

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