Gaia DR2 and EDR3 data and evolutionary status of post-AGB stars with high radial velocities

TL;DR

This study uses Gaia DR2 and EDR3 data to analyze the parallax, proper motion, and evolutionary status of twenty high radial velocity post-AGB star candidates, confirming nine as post-AGB stars and exploring their origins.

Contribution

It provides new insights into the evolutionary status and kinematics of high radial velocity post-AGB stars using Gaia data, including confirmation of nine stars as post-AGB and identification of halo members.

Findings

Nine stars confirmed as post-AGB with low initial mass

Two stars identified as halo population members

Discussion on the origin and evolution of high-velocity post-AGB stars

Abstract

Using the Gaia DR2 and EDR3 data and list of post-AGB candidates, we investigate the parallax, proper motion and binarity for twenty post-AGB stars and candidates having high radial velocities. From their Gaia distances their luminosities and kinematics are derived. The evolutionary status of these stars is discussed from their location on the post-AGB evolutionary tracks. Nine stars are confirmed to be post-AGB stars that have their initial main-sequence mass around one or two solar masses. From their kinematics information, two objects among them are identified to clearly belong to the halo population, suggesting that low-mass. We discuss on the origin and evolutionary status of other objects in the sample of this work with high radial velocities.