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Lego Figure holding a lego telescope. Photo

Eero Vaher

Doctoral student

Lego Figure holding a lego telescope. Photo

Finding the dispersing siblings of young open clusters : Dynamical traceback simulations using Gaia DR3

Author

  • E. Vaher
  • D. Hobbs
  • P. McMillan
  • T. Prusti

Summary, in English

Context. Stars tend to form in clusters, but many escape their birth clusters very early. Identifying the escaped members of clusters can inform us about the dissolution of star clusters, but also about the stellar dynamics in the galaxy. Methods capable of finding escaped stars from many clusters are required to fully exploit the large amounts of data in the Gaia era. Aims. We present a new method of identifying escaped members of nearby clusters and apply it to ten young clusters. Methods. We assumed the escaped stars were close to the cluster in the past and performed traceback computations based on the Gaia DR3 radial velocity subsample. For each individual star, our method produces a probability estimate that it is an escaped member of a cluster, and for each cluster it also estimates the field star contamination rate of the identified fugitives. Results. Our method is capable of finding fugitives that have escaped from their cluster in the last few ten million years. In many cases the fugitives form an elongated structure that covers a large volume. Conclusions. The results presented here show that traceback computations using Gaia DR3 data can identify stars that have recently escaped their cluster. Our method will be even more useful when applied to future Gaia data releases that contain more radial velocity measurements.

Department/s

  • Lund Observatory - Undergoing reorganization
  • Astrophysics

Publishing year

2023-11-01

Language

English

Publication/Series

Astronomy and Astrophysics

Volume

679

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: kinematics and dynamics
  • Open clusters and associations: general
  • Solar neighborhood
  • Stars: formation
  • Stars: kinematics and dynamics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-6361