Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2061v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Oct. 1985, p. 2061-2073.
Astronomy and Astrophysics
Astronomy
8
H Ii Regions, Hydrogen Ions, Peculiar Stars, Radio Sources (Astronomy), Astronomical Maps, Flux Density, O Stars, Radio Emission
Scientific paper
Radio observations, at various resolutions from 1arcmin to 4arcsec, have been made of the "peculiar" object S 121. It is shown that all radio data are consistent with S 121 being a complex H II region at a distance of 5 - 7 kpc. It consists of a dense core of diameter 1.4arcmin, with electron densities approaching 200 cm-3, embedded in a less dense extended structure with dimensions of about 10 arcmin. A model density distribution is developed that can account for all existing radio observations. The identified exciting star has been classified as O4. The nearby H II region S 120 has also been studied but in less detail. It is probably unrelated to S 121, being at a greater distance. The exciting star for S 120 is predicted to be about O9.5. A list of small-diameter (background) radio sources in the 2°-square field centered on S 121 is presented, as a by-product of this study.
Higgs Lloyd A.
Vallee Jacques P.
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