Evolutionary status of selected post-AGB stars based on Gaia DR3 data

TL;DR

This study uses Gaia DR3 data to determine the evolutionary stages of 24 post-AGB stars, confirming some as post-AGB, identifying others as post-RGB or post-HB, and reclassifying one star based on luminosity.

Contribution

It provides updated evolutionary classifications of post-AGB stars using precise Gaia DR3 parallaxes, revealing new insights and reclassifications.

Findings

14 stars confirmed as post-AGB based on luminosity

V1027 Cyg reclassified as a semi-regular variable star

Some stars identified as post-RGB or post-HB

Abstract

The evolutionary status of 24 post-AGB stars is presented based on Gaia DR3 data. All 24 stars have parallaxes accurate to better than 3 X sigma and have RUWE values less than 1.4. Based on the Gaia DR3 distances the absolute luminosities are derived. For 14 of the stars, the luminosities confirm their post-AGB evolutionary stage. However, V1027 Cyg, which was previously classified as a post-AGB star, is found to have a higher luminosity; thus it may be an evolved, massive, pulsating semi-regular variable star of type G7Ia. For 9 of the stars, the luminosities are lower than 1000 L (sun), indicating that some are post-RGB stars and some are post-HB stars.This paper was completed more than four months ago but there was delay in getting it published.