Abundance ratios [Na/Fe] vs. [N/Fe] of CEMP-no stars. The dots represent the star by Norris et al. (2013), the squares by Allen et al. (2012). The small vertical bars on the points indicate the main sequence or subgiant Li-poor stars. The small horizontal bars indicate the low-s stars (also noted b-). The light thick blue band represents the main trend of the observed points. The big blue arrow describes the effect of nuclear burning of 14N → 22Ne → 23Na, which contributes to the scatter of the figure. Small arrows indicate upper limits.
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