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We present high S/N spectroscopy of 15 emission-line galaxies (ELGs)cataloged in the KPNO International Spectroscopic Survey (KISS), selected fortheir possession of high equivalent width [O III] lines. The primary goal ofthis study was to attempt to derive direct-method ($T_e$) abundances for use inconstraining the upper-metallicity branch of the $R_{23}$ relation. The spectracover the full optical region from [O II]{\lambda}{\lambda}3726,3729 to [SIII]{\lambda}{\lambda}9069,9531 and include the measurement of [OIII]{\lambda}4363 in 13 objects. From these spectra, we determine abundanceratios of helium, nitrogen, oxygen, neon, sulfur, and argon. We find thesegalaxies to predominantly possess oxygen abundances in the range of 8.0$\lesssim$ 12+log(O/H) $\lesssim$ 8.3. We present a comparison of direct-methodabundances with empirical SEL techniques, revealing several discrepancies. Wealso present a comparison of direct-method oxygen abundance calculations usingelectron temperatures determined from emission lines of O$^{++}$ and S$^{++}$,finding a small systematic shift to lower $T_e$ (~1184 K) and highermetallicity (~0.14 dex) for sulfur-derived $T_e$ compared to oxygen-derived$T_e$. Finally, we explore in some detail the different spectral activity typesof targets in our sample, including regular star-forming galaxies, those withsuspected AGN contamination, and a local pair of low-metallicity,high-luminosity compact objects.

Metal Abundances of KISS Galaxies. V. Nebular Abundances of Fifteen Intermediate Luminosity Star-Forming Galaxies