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We present a study of Ks band luminosity evolution of the asymptotic giantbranch (AGB) population in simple stellar systems using star clusters in theLarge Magellanic Cloud (LMC). We determine physical parameters of LMC starclusters including center coordinates, radii, and foreground reddenings. Agesof 83 star clusters are derived from isochrone fitting with the Padova models,and those of 19 star clusters are taken from the literature. The AGB stars in102 star clusters with log(age) = 7.3 - 9.5 are selected using near-infraredcolor magnitude diagrams based on 2MASS photometry. Then we obtain the Ks bandluminosity fraction of AGB stars in these star clusters as a function of ages.The Ks band luminosity fraction of AGB stars increases, on average, as ageincreases from log(age) ~ 8.0, reaching a maximum at log(age) ~ 8.5, and itdecreases thereafter. There is a large scatter in the AGB luminosity fractionfor given ages, which is mainly due to stochastic effects. We discuss thisresult in comparison with five simple stellar population models. The maximum Ksband AGB luminosity fraction for bright clusters is reproduced by the modelsthat expect the value of 0.7 - 0.8 at log(age) = 8.5 - 8.7. We discuss theimplication of our results with regard to the study of size and mass evolutionof galaxies.

Ks Band Luminosity Evolution of the Asymptotic Giant Branch Population Based on Star Clusters in the Large Magellanic Cloud