For 239 red giants, [N/Fe] and 12C/13C are measured from CN lines; N trends match theory, but 12C/13C scatters from about 5 to 50 with no link to C/N anomalies.
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Photospheric nitrogen abundances and carbon 12C/13C ratios of red giant stars
For 239 red giants, [N/Fe] and 12C/13C are measured from CN lines; N trends match theory, but 12C/13C scatters from about 5 to 50 with no link to C/N anomalies.