Abstract
Using the newly installed SIS receiving system of the 13.7 m telescope of PMO, the CO isotope line pair, 13CO and C 18O J = 1 − 0, were observed in a search for dense cores in 64 IRAS sources with high color indices or H 2O masers. Maps were obtained for some of the sources. The line pair was detected in all the target sources. The emission of 13CO J = 1 − 0 is strong showing that the emission regions are dense. The pair lines of the CO isotopes were measured for the first time in at least 60 sources. Antenna temperatures, center velocities and line widths are obtained with Gaussian fitting. Preliminary analyses were made for the emission intensities and line profiles.
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