H II regions surrounding high galactic latitude O stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Density (Concentration), Emission Spectra, Forbidden Bands, H Alpha Line, H Ii Regions, O Stars, Stellar Spectrophotometry, Fabry-Perot Interferometers, Ionized Gases, Radial Velocity, Sky, Spectrum Analysis

Scientific paper

Scans of H-alpha and the N II 6584 A forbidden line were obtained in directions toward 13 O stars that have galactic latitudes greater than 10 deg, and z distances between 60 pc and 1000 pc. The associated H II regions have emission measures that range from 500/cm to the 6th pc to less than 2/cm to the 6th pc, and radii that extend from about 20 pc to more than 200 pc from the star. The derived rms electron densities for these regions range from about 3/cu cm for absolute z values lower than 100 pc to less than 0.1/cu cm for absolute z values greater than 600 pc.

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