I will review recent results obtained with the Chandra X-ray Observatory on three sources, EX Hya, CCO Cas A and RS Oph. In a 500 ks Chandra/HETG observation of the intermeciate polar EX Hya, we were able to detect for the first time photoionized features previously hidden under strong collisionally excited emission lines. We obtained the, so far, cleanest spectrum of the Central Compact Object of the SNR Cas A. The spectrum, light curve and image of this "unknown" compact object allowed us to put tight constrains on its nature. The high spatial resolution of Chandra, combined with powerful image deconvolution techniques allowed us to detect, for the first time, an extended structure in the ejecta of the recurrent nova RS Oph, which apparently was generated during the last outburst in 2006. I will discuss some of the implication and possible origins of these detections in the context of accretion onto intermediate polars, the study of compact objects in SNR and mass ejection from recurrent nova.