084088

Symbiotic binaries---compact objects openPartypically white dwarfsclosePar accreting from cool giants--- are laboratories for accretion physics and the progenitors of some supernovae. The giant outshines many optical signatures of accretion comma so almost all known symbiotics have been found through emission line surveys. Symbiotics identified in this way often contain luminous WDs with shell burning on their surfaces. But now comma using the SkyMapper survey comma we are using uvg colors and variability to find both burning and non-burning symbiotics. Here we request sensitive X-ray exposures and UV light curves of our best candidates comma which only XMM can provide. Detecting X-ray emission with EPIC or UV flickering with the OM will validate our method and reveal a hidden population of non-burning symbiotics.