[N/Fe] vs. [C/Fe] for CEMP dwarfs and turnoff stars from the recent literature (Sivarani et al. 2006, diamonds), (Behara et al. 2010, stars), (Masseron et al. 2012, open circles), (Christlieb et al. 2002, asterisk), and for our stars SDSS J111407+182831 and SDSS J1143+2020 (filled circles). The AGB models predicted by Herwig et al. (2004), for [Fe/H] = −2.3 and initial masses 6 M⊙ (HBB) and 2 M⊙ (non-HBB) are labeled (triangles).
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