We have conducted surface photometry of a spiral galaxy NGC4419, by making use of photographic plates in U, B, V and R-bands taken by 105cm Schmidt Camera at Kiso Observatory. Two dimensional surface brightness distributions as well as luminosity profiles along the major axis are examined in detail to decipher the morphological properties of the galaxy. Analysis of the color distributions of NGC4419 shows that B-V and U-B colors remain constant throughout the galaxy with a weak trend of blue bulge in B-V color. The blue bulge might indicate an active star formation in the nucleus of NGC4419. For a quantitative analysis of the luminosity distribution of NGC4419, the observed luminosity profiles are decomposed into bulge and disk components, assuming the bulge component to follow de Vaucouleurs γ 1 / 4 − l a w while the disk component is assumed to be exponential. The fitting generally fails at the central part and at the shoulder near r = 15' where bulge and disk components overlap. The failure at the central part cannot be attributed wholly by the seeing disk since the core-radius of the central plateau is much larger than the width of point spread function. The failure at shoulder could be due to the luminosities from the spiral arms.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. THE PLATE MEASUREMENTS AND DATA REDUCTION
Ⅲ. LUMINOSITY DISTRIBUTION
Ⅳ. PROFILE DECOMPOSITION
Ⅴ. SUMMARY AND CONCLUSION
ACKNOWLEDGEMENTS
REFERENCES

• LEE HYUNG MOK(Department of Earth Sciences, Pusan National University)
• ANN HONG BAE(Department of Earth Sciences, Pusan National University)
• CHOI JEONG TAE(Department of Earth Sciences, Pusan National University)