Radio observations of the CMa OB1 H II regions

Details Radio observations of the CMa OB1 H II regions Radio observations of the CMa OB1 H II regions

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..155g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 1, 1984, p. 155-165.

Astronomy and Astrophysics

Astronomy

6

B Stars, H Ii Regions, Interstellar Gas, O Stars, Radio Astronomy, Astronomical Maps, Continuous Spectra, Emission Spectra, H Alpha Line

Scientific paper

A sensitive 10°×15° 13-cm map made of the CMa OB1 H II regions' radio emission shows a strong similarity to Hα emission photographs. Sharpless 296 is shown to consist of a prominent central and western arc completed by a weaker southern loop, and with a faint northern bar. The emission is thermal, superimposed over a predominantly non-thermal background. The H142α recombination line has been detected at eight positions in S296, and in S292 and S297. The average electron temperature in S296 is 6900±1300K. The UV fluxes from the CMa OB1 stars account for the observed emission measures of the H II regions. The H142α spectral line velocities indicate that the ionized material is in contact with the molecular clouds.

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