Four HII regions of the Sd galaxy NGC 7793 were observed using AAT/IPCS. From these spectra we determined abundances of the elements using observed emission lines and electron temperatures. The calculated abundances show that this galaxy does not show any significant radial abundance gradient. The mean oxygen abundance is very much like the Orion nebulae and the nitrogen abundance is similar to the late type barred spiral galaxy NGC 1313.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. OBSERVATION AND REDUCTION
Ⅲ. ABUNDANCE ANALYSIS
Ⅳ. DISCUSSIONS
REFERENCES

• CHUN MUN-SUK(Department of Astronmy and Meteorology, Yonsei University)