Measurements of [O I] λ6300/Hα Line Intensity Ratios for Four O Star H II Regions

Details Measurements of [O I] λ6300/Hα Line Intensity Ratios for Four O Star H II Regions Measurements of [O I] λ6300/Hα Line Intensity Ratios for Four O Star H II Regions

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124.3336h&link_type=abstract

The Astronomical Journal, Volume 124, Issue 6, pp. 3336-3339.

Astronomy and Astrophysics

Astronomy

7

Ism: H Ii Regions, Ism: Clouds, Ism: General

Scientific paper

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=6.3d,b=+23.6d), S252 (l=190.1d,b=+0.6d), S261 (l=194.1d,b=-1.9d), and S264 (l=195.1d,b=-12.0d). 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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