A survey of CO emission in molecular regions of different types

Using a recently installed system on the 13.7-m radio telescope of the Qinh ai Station of Purple Mountain Observatory at Delingha, we searched for (CO) -C-12 J = 1-0 emission in a group of sources including H II region candidat es,dense cores, Bok globules and pre-main sequence stars and late-type star s. The emission was detected in all the star-forming regions of different m asses. The discovery of such features as large line widths, red and blue wi ngs, variations in the core velocity and multiple emission indicates probab le existence of double jets, expansion or multiple knots. The emission line was seen in two evolved late-type stars, indicating dense circumstellar ga s envelopes.