A census of Post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars. (arXiv:2208.02832v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Oudmaijer_R/0/1/0/all/0/1">René D. Oudmaijer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jones_E/0/1/0/all/0/1">Emma R. M. Jones</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vioque_M/0/1/0/all/0/1">Miguel Vioque</a>
This paper presents the first census of Galactic post-Asymptotic Giant Branch
stars in the HR diagram. We combined Gaia DR3 parallax-based distances with
extinction corrected integrated fluxes, and derived luminosities for a sample
of 185 stars that had been proposed to be post-AGB stars in the literature. The
luminosities allow us to create an HR diagram containing the largest number of
post-AGB candidate objects to date. A significant fraction of the objects fall
outside the typical luminosity range as covered by theoretical evolutionary
post-AGB tracks as well as observed for Planetary Nebula central stars. These
include massive evolved supergiants and lower luminosity objects. Here we
highlight the fact that one third of the post-AGB candidates is underluminous
and we identify these with the recently recognised class of post-Red Giant
Branch objects thought to be the result of binary evolution.
This paper presents the first census of Galactic post-Asymptotic Giant Branch
stars in the HR diagram. We combined Gaia DR3 parallax-based distances with
extinction corrected integrated fluxes, and derived luminosities for a sample
of 185 stars that had been proposed to be post-AGB stars in the literature. The
luminosities allow us to create an HR diagram containing the largest number of
post-AGB candidate objects to date. A significant fraction of the objects fall
outside the typical luminosity range as covered by theoretical evolutionary
post-AGB tracks as well as observed for Planetary Nebula central stars. These
include massive evolved supergiants and lower luminosity objects. Here we
highlight the fact that one third of the post-AGB candidates is underluminous
and we identify these with the recently recognised class of post-Red Giant
Branch objects thought to be the result of binary evolution.
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