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Article Contents
1 Introduction
2 Sample selection and spectral combination
3 Correction for stellar absorption and extinction
4 Consistency checks of the empirical O/H estimates using the R23 method
5 The "direct'' oxygen abundances derived from electron temperature $T_{{\rm e}}$
6 Comparisons between the $T_{{\rm e}}$-based (O/H) and those from empirical strong-line methods
7 The log(N/O) abundance ratios
8 Discussion
9 Conclusion
References
Online Material
List of tables
List of figures
Copyright ESO 2007
Published by EDP Sciences