-Orionis Ring W.J. Lang , M.R.W. Masheder, PASA, 15 (1), 70
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Conclusions
- The results of this survey greatly improve on those of the older 1.2m CO survey (MM). The lowest contour of our maps is around ten times lower than that of the MM survey.
- The spherically symmetric, single cloud model of HII region/cloud interaction is inappropriate here, despite the apparent symmetry of the region. We require a multi-cloud model which explains the two-component velocity structure.
- The CO correlates very well with IRAS 100
except in several small regions of excess UV-radiation: around the central OB-cluster and the HII region S263 embedded within the B223 complex. - A further worthy comparison is with H
-emission, particularly when considering the direct interaction between dense clouds and the stellar UV-fields in the form of `bright rims'. H images also enable us to determine which molecular clouds are associated with the HII region.
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