We analyzed the luminosity profiles of 104 bright barred galaxies to examine the frequency of occurrence of the Type II disk which is thought to be the result of redistribution of disk material by bar potential. Our analysis of the elliptically averaged major axis profiles shows that about 70% of the present sample seem to have Type II disks with a weak tendency of preferential occurrence of type II disks in the late type galaxies. there is a subgroup of Type II disks which is characterized by a flat luminosity distribution in the middle disk, followed by a steep decline in the outer parts. Most of the galaxies with strong bars tend to have Type II disks. The present study strongly suggests that Type II disk is an evidence for the secular evolutions in disk galaxies.

• Ann Hong Bae(Department of Earth Science, Pusan National University)