Search for Wolf-Rayet Stars in Massive Star Clusters

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In order to investigate not only the formation, evolution process, and age of massive star clusters but also distribution and contribution to interstellar medium, we had carried out near-infrared spectroscopic imaging observation. NIR narrow-band filters (ex; 1.875um, 2.07um) which is customized for detection of massive stars and broad-band filter (Ks) are used for the observation. In the massive star clusters, many type of massive stars exist ; that is, Wolf-Rayet stars which are seemed to be the progenitors of Ib/c type supernovae, Luminous Blue Variable (LBV), Yellow Hyper Giant (YHG), Red Super GIant (RSG), and so on. The color-color diagram that is derived from these NIR filters gives us color information of reddening object by dust. Therefore the diagram is effective for not only detection of emission stars but also understanding of various stage of evolution from birth to end for massive stars.