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We present narrow-band Halpha and [OIII] images, and high-resolution,long-slit spectra of the planetary nebulae (PNe) Abell36, DeHt2, and RWT152aimed at studying their morphology and internal kinematics. These data arecomplemented with intermediate-resolution, long-slit spectra to describe thespectral properties of the central stars and nebulae. The morphokinematicalanalysis shows that Abell36 consists of an inner spheroid and two brightpoint-symmetric arcs; DeHt2 is elliptical with protruding polar regions and abright non-equatorial ring; and RWT152 is bipolar. The formation of Abell36 andDeHt2 requires several ejection events including collimated bipolar outflowsthat probably are younger than and have disrupted the main shell. The nebularspectra of the three PNe show a high excitation and also suggest a possibledeficiency in heavy elements in DeHt2 and RWT152. The spectra of the centralstars strongly suggest an sdO nature and their association with PNe points outthat they have most probably evolved through the asymptotic giant branch. Weanalyze general properties of the few known sdOs associated to PNe and findthat most of them are relatively or very evolved PNe, show complexmorphologies, host binary central stars, and are located at relatively highGalactic latitudes.

The physical structure of planetary nebulae around sdO stars: Abell36, DeHt2, and RWT152