A census of Post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars
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 lite...
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| creator | Oudmaijer, René D Jones, Emma R M Vioque, Miguel |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.2208.02832 |
| format | Article |
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| subjects | Asymptotic giant branch stars Evolution Hertzsprung-Russell diagram Luminosity Object recognition Parallax Physics - Astrophysics of Galaxies Physics - Solar and Stellar Astrophysics Planetary nebulae Supergiant stars |
| title | A census of Post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars |
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