Rule or exception? Planetary nebulae around hot subdwarf stars
  In this work, we present the first results of an ongoing survey to search for planetary nebulae (PNe) around hot subdwarf stars (sdOs). Deep images and intermediate-resolution long-slit spectra of RWT 152, the only confirmed PN+sdO system in the northern hemisphere, as well as preliminary results for other sdO+PN candidate are presented. 
A. Aller (1), L.F. Miranda (1,2), A. Ulla (1), R. Oreiro (3), M.   Manteiga (4), E. P\'erez (1) and C. Rodr\'iguez-L\'opez (...
astro-ph.SR