Radio, infrared, and optical observations of compact H II regions. IV - The nebula S235B

Details Radio, infrared, and optical observations of compact H II regions. IV - The nebula S235B Radio, infrared, and optical observations of compact H II regions. IV - The nebula S235B

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109..223k&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 2, May 1982, p. 223-227. NSF-supported research.

Astronomy and Astrophysics

Astronomy

15

H Ii Regions, Infrared Astronomy, Light (Visible Radiation), Nebulae, Radio Astronomy, Stellar Evolution, Emission Spectra, Galactic Structure, H Alpha Line, Hydrogen Recombinations, Infrared Spectra, Interstellar Extinction, Milky Way Galaxy, Radio Spectra, Silicates

Scientific paper

Radio, infrared, and optical observations of the ultra-compact H II region S235B, which lies in the galactic anticenter direction in a region of recent and ongoing star formation. The nebula has yet to be detected in the radio, but this can be understood, and the infrared and optical data explained, in terms of a two-component structure. The very dense, compact, core component is optically thick in the radio and is responsible for essentially all of the observed B alpha and gamma recombination line fluxes. An optically thin, tenuous halo surrounding the core is seen on optical photographs. In addition to the B alpha and gamma lines, the infrared spectrum shows the unidentified 3.28, 8.7, and 11.3 micron emission features. A multicomponent fit to the 8-13 micron spectrum indicates at most a weak silicate feature, consistent with reddening estimates that show only marginal extinction. Because the B alpha and gamma lines might be optically thick, they cannot be used to deduce the reddening.

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