Poster abstract details

Hot subdwarf O stars (sdOs) are blue low-mass stars evolving towards the white dwarf phase, although their origin is still unknown. Investigating the association of sdOs with planetary nebulae (PNe) is essential to confirm a post-AGB origin or to favour other progenitors. To date, only four sdOs associated with a PN are known, but are they the rule or the exception? In this work, we present deep images and intermediate-resolution long-slit spectra of RWT 152, the only known PN+sdO system in the northern hemisphere. These data allow us, for the first time, to analyze the morphology of the nebula as well as the absorption spectrum of the central star. We also show preliminary results for other sdO+PN candidate, in the context of an ongoing survey of PNe around sdOs.