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We identify and characterize low-mass stars in the ~3 Myr old Trumpler 16(Tr16) region by means of a deep Chandra X-ray observation, and study theiroptical and near-IR properties. We compare X-ray activity of Tr16 stars withknown characteristics of Orion and Cygnus OB2 stars. We analyzed a 88.4 ksecChandra ACIS-I observation pointed at the center of Tr16. Because of diffuseX-ray emission, source detection was performed using the PWDetect code for twodifferent energy ranges: 0.5-8.0 keV and 0.9-8.0 keV. Results were merged intoa single final list. We positionally correlate X-ray sources with optical and2MASS catalogues. Source events were extracted with the IDL-based routineACIS-Extract. X-ray variability was characterized using the Kolmogorov-Smirnovtest and spectra were fitted by using XSPEC. X-ray spectra of early-type,massive stars were analyzed individually. Our list of X-ray sources consists of1035 entries, 660 of which have near-IR counterparts and are probablyassociated with Tr16 members. From near-IR color-color and color-magnitudesdiagrams we compute individual masses of stars and their Av values. About 15%of the near-IR counterparts show disk-induced excesses. X-ray variability isfound in 77 sources. X-ray emission from OB stars appear softer than thelow-mass stars. The Tr16 region has a very rich population of low-mass X-rayemitting stars. An important fraction of its circumstellar disks survive theintense radiation field of its massive stars. Stars with masses 1.5-2.5 Modisplay X-ray activity similar to that of stars in Cyg OB2 but much lessintense than observed for Orion Nebula Cluster members.

An X-ray survey of low-mass stars in Trumpler 16 with Chandra