  Blue straggler stars present as secure members in the Galactic open clusters
form a major challenge to the conventional picture of evolutionary population
synthesis based on the stellar evolution theory of single stars, as illustrated
in our previous work. Expansion of our sample in the current work to include
younger age clusters provides a larger data base to expose the question raised
for the simple stellar population model. The working sample now includes 97
Galactic open clusters of ages ranging from 0.1 to several Gyrs. The
contributions of blue straggler stars to the integrated light of the host
clusters are calculated on an individual cluster base. A data base of
observational constrained simple stellar population model is made which has a
larger age coverage than our previous work. It is shown in this work that the
general existence of blue stragglers in star clusters of our sample
dramatically altered the predictions of convectional stellar population model
in terms of spectral energy distribution. The integrated spectral energy
distributions of the synthetic spectra of the clusters are enhanced towards
shorter wavelengths, therefore the results of the present work will cast new
lights in understanding the properties of stellar populations.
