Abstract
We have used the Wisconsin Hα Mapper facility to measure the [O I] λ6300/Hα line intensity ratios for four O star H II regions: S27 (observation coordinates l = 63, b = +236), S252 (l = 1901, b = +06), S261 (l = 1941, b = -19), and S264 (l = 1951, b = -120). We find that the ratios range from 0.0015 to 0.0053. These results are roughly a factor of 10 lower than measured [O I]/Hα ratios in directions that sample the warm ionized component of the interstellar medium. This difference implies a significantly lower hydrogen ionization ratio n(H+)/n(H0) or higher electron temperature in the diffuse ionized gas compared with that in the bright discrete O star H II regions.
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