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Fig. 7.

image

C, N, and O abundances as functions of effective temperature for the same stars as functions of effective temperature for three studies (this work, first column; uncalibrated APOGEE DR14, second column; and Mészáros et al. 2015, third column). Blue triangles indicate upper limits. Our results show that C, N, and O abundances have mostly upper limits for Teff > 4600 K, whereas the APOGEE DR14 results do not provide upper limits. Mészáros et al. (2015) chose not to provide C, N, O values for Teff > 4500 K. There is a significant trend in our O determinations compared to the two other studies for which we do not have a clear explanation (see text).

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