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Using the highest-resolution X-ray observation of the Trumpler 15 starcluster taken by the Chandra X-ray Observatory, we estimate the total size ofits stellar population by comparing the X-ray luminosity function of thedetected sources to a calibrator cluster, and identify for the first time asignificant fraction (~14%) of its individual members. The highest-resolutionnear-IR observation of Trumpler 15 (taken by the HAWK-I instrument on the VLT)was found to detect most of our X-ray selected sample of cluster members, witha K-excess disk frequency of 3.8+-0.7%. The near-IR data, X-ray luminosityfunction, and published spectral types of the brightest members support acluster age estimate (5-10 Myr) that is older than those for the nearbyTrumpler 14 and Trumpler 16 clusters, and suggest that high-mass members mayhave already exploded as supernovae. The morphology of the inner ~0.7 pc coreof the cluster is found to be spherical. However, the outer regions (beyond 2pc) are elongated, forming an `envelope' of stars that, in projection, appearsto connect Trumpler 15 to Trumpler 14; this morphology supports the view thatthese clusters are physically associated. Clear evidence of mass segregation isseen. This study appears in a Special Issue of the ApJS devoted to the ChandraCarina Complex Project (CCCP), a 1.42 square degree Chandra X-ray survey of theGreat Nebula in Carina.

A Chandra ACIS Study of the Young Star Cluster Trumpler 15 in Carina and Correlation with Near-infrared Sources