Fig. 2
CNO in B6-b6: fits to the Swan C2 (0, 1) bandhead at 5635.2 Å, the red CN (5, 1) bandhead at 6332.18 Å, and the forbidden oxygen [OI]6300.31 Å line. Dotted line: observed spectrum; red line: synthetic spectra giving the best fit: [C/Fe] = −0.07, [N/Fe] = +0.7, [O/Fe] = 0.0; blue lines: synthetic spectra computed with [C/Fe] = −0.10 and −0.05, [N/Fe] = +0.6 and +0.8, and [O/Fe] = −0.1 and +0.1.
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