For ∼ 240 nearby stars their age and mass were determined and kinematic parameters determined for 362 stars, applying Woolley's three-dimensional potential. Metallicity and kinematic parameters of these stars were correlated with their age, suggesting the slow collapse ( t ≳ a few billion years) of the Galaxy and the initial rapid enrichment in metal abundance ( Δ Z ≈ 1 / 3 Z 1 (present) for ∼ 4 × 10 8 yrs). The late slow enrichment rate is given by d ( Z / Z ⊙ ) / d t = 5.9 ∼ 7.0 ± 3.4 per Gyr.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. OBSERVATIONAL DATA
Ⅲ. DERIVATIONS OF PHYSICAL AND KINEMATIC PARAMETERS
Ⅳ. CORRELATIONS OF AGE WITH METALLICITY AND KINEMATIC PARAMETERS
Ⅴ. CONCLUSION
REFERENCES

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