Effects of cloud rotation 011 the profiles of CO J= 1 → 0 lines arc investigated by theoretically general ing line profiles under physical conditions similar to t he ones in large globules. The synthesized profiles are presented and their characteristics are discussed. It is found that when the Doppler shift of the observed CO lines is interpreted as the rotation velocity, the optically thin 13 C O lines underestimate the rotation velocity by up to 10 percents, while the self-reversed optically thick 12 C O lines overestimate the velocity up to 20 percents. The optically thin line is shown to be of use in probing the distribution of rotation velocity in dark globules.

ABSTRACT
    Ⅰ. INTRODUCTION
    Ⅱ. BASIC EQUATIONS FOR NON-LTE LINE TRANSFER
    Ⅲ. NUMERICAL PROCEDURES AND MODEL PARAMETERS
    Ⅳ. SYNTHESIZED LINE PROFILES
    Ⅴ. CONCLUDING REMARK
    ACKNOWLEDGEMENTS
    REFERENCES

• Y. S. PARK(Daeduk Radio Astronomy Observatory, KAO)
• H. S. YUN(Department of Astronomy, Seoul National University)
• S. S. HONG(Department of Astronomy, Seoul National University)
• H. M. LEE(Department of Earth Sciences, Pusan University)