We present integrated Washington CT _ { 1 } photometry of 18 bright blue objects discovered in the dwarf galaxy UGC 7636 which is located 5 ^ { \prime } .5 southeast of the giant elliptical galaxy NGC 4472 , the brightest galaxy in the Virgo cluster .
Several lines of evidence indicate that UGC 7636 is interacting violently with NGC 4472 .
These objects are very blue with colors of -0.4 < ( C - T _ { 1 } ) < 0.6 , and their magnitudes are in the range of 20.6 < T _ { 1 } < 22.9 mag which corresponds to absolute magnitudes of -10.6 < M _ { T _ { 1 } } < -8.3 mag for a distance modulus of ( m - M ) _ { 0 } = 31.2 .
These objects are grouped spatially in three regions : the central region of UGC 7636 , the tidal tail region , and the HI cloud region .
No such objects were found in the counter tail region .
It is concluded that these objects are probably young star clusters which formed < 10 ^ { 8 } yr ago during the interaction between UGC 7636 and NGC 4472 .
Surface photometry of UGC 7636 ( r < 83 ^ { \prime \prime } ) shows that there is a significant excess of blue light along the tidal tail region compared with other regions .
The star clusters are bluer than the stellar light in the tidal tail region , indicating that these clusters might have formed later than most stars in the tidal tail region which were formed later than most stars in the main body of the galaxy .