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This paper presents the first census of Galactic post-Asymptotic Giant Branchstars in the HR diagram. We combined Gaia DR3 parallax-based distances withextinction corrected integrated fluxes, and derived luminosities for a sampleof 185 stars that had been proposed to be post-AGB stars in the literature. Theluminosities allow us to create an HR diagram containing the largest number ofpost-AGB candidate objects to date. A significant fraction of the objects falloutside the typical luminosity range as covered by theoretical evolutionarypost-AGB tracks as well as observed for Planetary Nebula central stars. Theseinclude massive evolved supergiants and lower luminosity objects. Here wehighlight the fact that one third of the post-AGB candidates is underluminousand we identify these with the recently recognised class of post-Red GiantBranch objects thought to be the result of binary evolution.

A census of Post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars