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

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Abstract

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.

Detaljer

Författare
  • 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
Enheter & grupper
Externa organisationer
  • Keele University
  • INAF - Osservatorio Astrofisico di Arcetri
  • University of Barcelona
  • University of Cambridge
  • INAF - Osservatorio Astronomico di Padova
  • University of Valparaíso
  • University of Cádiz
  • Andrés Bello National University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi

Nyckelord

Originalspråkengelska
Sidor (från-till)4701-4716
Antal sidor16
TidskriftMonthly Notices of the Royal Astronomical Society
Volym496
Utgåva nummer4
StatusPublished - 2020
PublikationskategoriForskning
Peer review utfördJa