C¹⁸O and C¹⁷O Observations of Embedded Young Stars in the Taurus Molecular Cloud. I. Integrated Intensities and Column Densities

Abstract

We report on the results of a survey of C18O and C17O toward the 20 most deeply embedded young stars in the Taurus molecular cloud. Most of the sources have been observed in both the J \ 10 and J \ 21 transitions of each species. The analysis shows that in general the C17O emission is optically thin, whereas the C18O emission has optical depths between 0.5 and 1.0. The material traced by these lines has an excitation temperature of D8 K and column density ranging from 3 to 42 ] 1021 cm~2. The column density toward a source is found to be inversely correlated with the sources bolometric temperature,