The H II regions ionized by Sigma and Tau SCO

Details The H II regions ionized by Sigma and Tau SCO The H II regions ionized by Sigma and Tau SCO

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..339g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 15, 1984, p. 339-345.

Astronomy and Astrophysics

Astronomy

3

Binary Stars, H Ii Regions, Nebulae, O Stars, Radio Astronomy, Astronomical Models, Centimeter Waves, H Alpha Line, Hydrogen Ions, Lyman Spectra, Scorpius Constellation

Scientific paper

The H142α line has been detected in Sharpless 9, which is ionized by σ Sco, and in RCW 129, ionized by τ Sco. The electron temperatures in the two H II regions are 5700±340K and 4200±600K respectively. The thermal radio emission from S9 is asymmetric with respect to the stellar position, and the emission peak coincides with the position of the optical red emission features to the north and west of the star. There is no evidence for collisional excitation. S9 is a density-bounded H II region in the champagne phase, the bright rims and radio peak marking the ionization front.

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