Searching for Hα emitters in the Gaia DR3 variable catalog

We present the preliminary results of our attempt to create the first catalog of Hα emitters in the recently published list of ~12 million variable sources from GAIA DR3. We computed the IPHAS synthetic photometry for 855 White Dwarfs (WD), 977 Cataclysmic Variables (CV) and ~1000000 Long-Period Variables (LPV) from GAIA's low-resolution spectra. We have unveiled 11 WD, 191 CV and 3,925 LPV as potential Hα-emitters based on the IPHAS selection criteria. From these candidates we have also identified 1077 SYST candidates and 39 PNe candidates based on recently established infrared (IR) selection criteria for SYSTs and PNe.