Measurements of [O [CSC]i[/CSC]] λ6300/Hα Line Intensity Ratios for Four O Star H [CSC]ii[/CSC] Regions

Autor:	Ronald J. Reynolds, L. M. Haffner, N. R. Hausen
Rok vydání:	2002
Předmět:	Physics Hydrogen Analytical chemistry chemistry.chemical_element Astronomy and Astrophysics Plasma Intensity ratio Interstellar medium chemistry Space and Planetary Science Ionization Electron temperature O-type star Line (formation)
Zdroj:	The Astronomical Journal. 124:3336-3339
ISSN:	1538-3881 0004-6256
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::03477bffb9bb5667787f5d3dd4e3b713 https://doi.org/10.1086/344603 Zobrazit plný text záznamu