Updated parameters of 1743 open clusters based on Gaia DR2

TL;DR

This paper provides updated, homogeneous fundamental parameters for 1743 open clusters using Gaia DR2 data, including distances, ages, and velocities, improving cluster characterization and identifying dubious clusters.

Contribution

It presents a comprehensive reanalysis of open cluster parameters with Gaia DR2, including new radial velocity measurements for 198 clusters and a systematic offset assessment.

Findings

Parameters for 1743 open clusters are provided.

Radial velocities for 831 clusters, including 198 new measurements, are estimated.

A systematic offset of -0.05 mas in distance estimates was identified.

Abstract

In this study we follow up our recent paper (Monteiro et al. 2020) and present a homogeneous sample of fundamental parameters of open clusters in our Galaxy, entirely based on Gaia DR2 data. We used published membership probability of the stars derived from Gaia DR2 data and applied our isochrone fitting code, updated as in Monteiro et al. (2020), to GB and GR Gaia DR2 data for member stars. In doing this we take into account the nominal errors in the data and derive distance, age, and extinction of each cluster. This work therefore provides parameters for 1743 open clusters and, as a byproduct, a list of likely not physical or dubious open clusters is provided as well for future investigations. Furthermore, it was possible to estimate the mean radial velocity of 831 clusters (198 of which are new and unpublished so far) using stellar radial velocities from Gaia DR2 catalog. By comparing the open cluster distances obtained from isochrone fitting with those obtained from a maximum likelihood estimate of individual member parallaxes, we found a systematic offset of $(-0.05\pm0.04)$mas.