Published in PASP 102, 1359, 1990
Abstract. We study the gas abundance in Seyfert 2 and LINER nuclei using optical emission-Line data for a sample of 177 galaxies obtained from the literature. On the basis of photoionization model results it is shown that the range presented by the emission-line ratios [S II] / H and [N II] / H, can only be reproduced by a range in sulfur and nitrogen abundances from half-solar to five times solar. The abundances of these two elements seem to be correlated. It is also shown that, if the apertures are small enough, the observed [S II] / H values indicate overabundance of sulfur for most Seyfert 2 and LINER nuclei. A similar result has been previously found for nitrogen.
Key words: active nuclei-abundances
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