Spectroscopy of Outlying H II Regions in Spiral Galaxies: Abundances and Radial Gradients
L. van Zee, J. J. Salzer, M. P. Haynes, A. A. O'Donoghue, T. J. Balonek
Abstract
We present the results of low dispersion optical spectroscopy of 186 H II regions spanning a range of radius in 13 spiral galaxies. Abundances for several elements (oxygen, nitrogen, neon, sulfur, and argon) were determined for 185 of the H II regions. As expected, low metallicities were found for the outlying H II regions of these spiral galaxies. Radial abundance gradients were derived for the 11 primary galaxies; similar to results for other spiral galaxies, the derived abundance gradients are typically -0.04 to -0.07 dex/kpc.
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