We present a method for deriving most optimal filter system by which the accuracy of derived physical quantities can be maximized. Using Kurucz(1978)'s model atmospheres, an optimal four filter system for F and G dwarfs is suggested, for which mean wavelengths are located at 3400|AA , 3850|AA , 4190|AA , and 4600 |AA with half-bandwidth of 200|AA . It is found that 35, 38 and 42 filters of the DDO system and the S t r ¨ o m g r e n u and ν filters are close to those of the most optimal system.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. THE RESOLUBILITY PARAMETERS
Ⅲ. MOST OPTIMAL FILTER SYSTEM
Ⅳ. COMPARISON WITH OTHER FILTER SYSTEMS
Ⅴ. CONCLUSION
REFERENCES

• PARK NAM-KYU(Department of Astronomy, Seoul National University)
• LEE SEE-WOO(Department of Astronomy, Seoul National University)