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High-resolution photoelectric scans of portions of the (2-0) band of the CN red system have been analyzed to obtain the isotopic abundance ratio for two K giants. The results are 12C/11C = 12 i 2 for a Serpentis and 7.2 t 1.5 for a Bootis. An attempted independent determination of the 12C/13C ratio for a Ser from the CH A4200 band is discussed briefly. The marked enhancement of the isotope 13C relative to the solar-system abundance (12C/13C = 89) is in qualitative agreement with recent theoretical ideas on mixing in red giants. Subject headings: abundances, stellar - late-type stars - molecules - stars, individual
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Day et al. (1973) studied this question.
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