Abstract Gaia DR3 parallaxes of a sample of post-AGB candidates have allowed us to unequivocally establish their evolutionary stage. Making use of the available photometry, interstellar extinction, and parallax-derived distance, their spectral Energy Distributions (SED) were fitted. From this, luminosity and effective temperature were worked out, placing them in the Hertzsprung-Russell (HR) diagram. This allows direct comparison with updated post-AGB evolutionary tracks, and estimation of their masses and evolutionary ages. As a result of that they were classified as post-AGB, YSO, and supergiant. From a sample of 146 candidates, 63 are post-AGB, 27 YSO, 5 supergiants, and 51 unconfirmed candidates. In addition, there were HST images for some of them, finding that very few post-AGB show a bipolar or multipolar structure.
Manchado et al. (Fri,) studied this question.
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