The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Thomas Bensby. Profile photo.

Thomas Bensby

Senior lecturer

Thomas Bensby. Profile photo.

The Gaia-ESO Survey : Membership probabilities for stars in 32 open clusters from 3D kinematics

Author

  • R. J. Jackson
  • R. D. Jeffries
  • N. J. Wright
  • S. Randich
  • G. Sacco
  • E. Pancino
  • T. Cantat-Gaudin
  • G. Gilmore
  • A. Vallenari
  • T. Bensby
  • A. Bayo
  • M. T. Costado
  • E. Franciosini
  • A. Gonneau
  • A. Hourihane
  • J. Lewis
  • L. Monaco
  • L. Morbidelli
  • C. Worley

Summary, in English

The Gaia-ESO Survey (GES) observed many open clusters as part of its programme to spectroscopically characterize the various Milky Way populations. GES spectroscopy and Gaia astrometry from its second data release are used here to assign membership probabilities to targets towards 32 open clusters with ages from 1 to 3800 Myr, based on maximum likelihood modelling of the 3D kinematics of the cluster and field populations. From a parent catalogue of 14 398 individual targets, 5032 stars with uniformly determined 3D velocities, Teff, log g, and chemistry are assigned cluster membership with probability >0.9, and with an average probability of 0.991. The robustness of the membership probabilities is demonstrated using independent membership criteria (lithium and parallax) in two of the youngest clusters. The addition of radial velocities improves membership discrimination over proper motion selection alone, especially in more distant clusters. The kinematically selected nature of the membership lists, independent of photometry and chemistry, makes the catalogue a valuable resource for testing stellar evolutionary models and investigating the time evolution of various parameters.

Department/s

  • Lund Observatory

Publishing year

2020

Language

English

Pages

4701-4716

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

496

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Open clusters and associations: general
  • Stars: evolution
  • Stars: pre-main-sequence

Status

Published

Project

  • Gaia-ESO Survey

ISBN/ISSN/Other

  • ISSN: 0035-8711