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We report results from the third in a series of nebular abundance studies ofemission-line galaxies from the KPNO International Spectroscopic Survey (KISS).Galaxies with coarse metallicity estimates of 12 + log(O/H) less than 8.2 dexwere selected for observation. Spectra of 14 galaxies, which cover the fulloptical region from [OII]3727,3729 to beyond [SII]6717,6731, are presented, andabundance ratios of N, O, Ne, S, and Ar are computed. The auroral [OIII]4363line is detected in all 14 galaxies. Oxygen abundances determined through thedirect electron temperature T_e method confirm that the sample is metal-poorwith 7.61 <= 12 + log(O/H) <= 8.32. By using these abundances in conjunctionwith other T_e-based measurements from the literature, we demonstrate that HIIgalaxies and more quiescent dwarf irregular galaxies follow similarmetallicity-luminosity (L-Z) relationships. The primary difference is azero-point shift between the correlations such that HII galaxies are brighterby an average of 0.8 B magnitudes at a given metallicity. This offset can beused as evidence to argue that low-luminosity HII galaxies typically undergofactor of two luminosity enhancements, and starbursts that elevate theluminosities of their host galaxies by 2 to 3 magnitudes are not as common. Wealso demonstrate that the inclusion of interacting galaxies can increase thescatter in the L-Z relation and may force the observed correlation towardslower metallicities and/or larger luminosities. This must be taken into accountwhen attempting to infer metal abundance evolution by comparing local L-Zrelations with ones based on higher redshift samples since the fraction ofinteracting galaxies should increase with look-back time.Comment: 36 pages, 5 figures. ApJ, in pres

astrophysical journal/the astrophysical journal

Metal Abundances of KISS Galaxies. III. Nebular Abundances for Fourteen Galaxies and the Luminosity‐Metallicity Relationship for H<scp>ii</scp>Galaxies

Metal Abundances of KISS Galaxies. III. Nebular Abundances for Fourteen Galaxies and the Luminosity‐Metallicity Relationship for HiiGalaxies