-Orionis Ring W.J. Lang , M.R.W. Masheder, PASA, 15 (1), 70
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Next Section: Observations
CO Observations of the 
-Orionis Ring
W.J. Lang 
M.R.W. Masheder
H.H. Wills Physics Laboratory, Bristol University, Tyndall Ave, Bristol, U.K, BS8 1TL
w.j.lang@bristol.ac.uk, mike.masheder@bristol.ac.uk
Abstract:
We present results from a new 
CO(J=
) survey of the -Orionis region. The observations cover 110 square degrees uniformly on a Nyquist-sampled grid. We discover CO-emission at levels far lower than possible in previous surveys, revealing a structure similar to that seen in IRAS 100
maps. We derive a total molecular mass of б 1.1
10
M
. A possible explanation for the isolated and localised outbreak of star-formation in the region is discussed.
Keywords: ISM: bubbles -- ISM:clouds -- ISM:HII regions -- ISM: molecules
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