Abstract
This paper reports filter photometry of CO band strengths at 2.36 (filter width = 0.18 for 23 carbon stars. Present results are compared with CO depression of 10 stars observed in 1970 at 2.29 with a spectral scanner (spectral resolution = 0.0032 ). Our CO index and the scanner index are linearly related, with a standard deviation of 0.04 mag. Each of the 23 carbon stars was also observed at the 3.2 band (filter width = 0.4 . The depression of this unidentified band increases with Na D line strength and C2 absorption. The 3.2 band lacks rotational line structure, and it occurs at the CH stretch frequency common to all hydrocarbon molecules. Our results suggest a possible association between the 3.2 M band and the C2H radical. Subject headings: infrared: spectra - stars: carbon
Published Version
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