Atmospheric parameters and abundances are calculated for 14 F and G dwarfs of the disk and halo populations with metal deficiencies between -2.3 and -0.3 on the basis of high-resolution spectra of the 3360-A NH and 4310-A CH bands obtained using a coudespectrograph and a 936-diode Digicon on the 2.7-m telescope at McDonald Observatory, with resolutions 26 pm (NH) and 12 pm (CH). The results are presented in tables and graphs and discussed in the light of theoretical models of N nucleosynthesis through CNO cycles. The identification of N as a primary element in these objects is explained by the tendency of O to be less deficient than C, N, or Fe.
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Tomkin et al. (1984) studied this question.