Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90..297b&link_type=abstract
Astronomy and Astrophysics, vol. 90, no. 3, Oct. 1980, p. 297-303.
Astronomy and Astrophysics
Astrophysics
26
B Stars, Hydroxyl Emission, Molecular Clouds, O Stars, Stellar Evolution, Carbon Monoxide, Emission Spectra, Infrared Stars, Interstellar Extinction, Optical Thickness, Orion Constellation, Taurus Constellation
Scientific paper
The molecular complexes in Orion and Taurus have been mapped in both OH main lines over a large (greater than 20 x 20 deg) area of sky in order to trace out their full extent. The derived column density and total mass of the complexes are in good agreement with CO results. The molecular emission in Orion is embedded in a large H I complex that extends 200 pc below the plane. The Orion A and B complexes lie at the edge of this H I complex, defining a sharp boundary between gas and dust rich and poor regions. Star formation efficiency in Orion is 5-10%. The Taurus molecular complex is surrounded by small clouds. Coagulation of these small clouds could balance the present gas depletion rate due to the low rate of star formation. However, formation of an OB association would destroy the molecular complex in 10 million yr.
Baud B.
Wouterloot Jan G. A.
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