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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2019

Age determination for 269 $Gaia$ DR2 Open Clusters

D. Bossini
  • Fonction : Auteur
A. Vallenari
  • Fonction : Auteur
A. Bragaglia
T. Cantat-Gaudin
R. Sordo
  • Fonction : Auteur
C. Jordi
C. Soubiran
L. Casamiquela
R. Carrera
U. Heiter
  • Fonction : Auteur

Résumé

$Context$. Gaia Second Data Release provides precise astrometry and photometry for more than 1.3 billion sources. This catalog opens a new era concerning the characterization of open clusters and test stellar models, paving the way for a better understanding of the disc properties. $Aims$. The aim of the paper is to improve the knowledge of cluster parameters, using only the unprecedented quality of the Gaia photometry and astrometry. $Methods$. We make use of the membership determination based on the precise Gaia astrometry and photometry. We apply anautomated Bayesian tool, BASE-9, to fit stellar isochrones on the observed G, GBP, GRP magnitudes of the high probability member stars. $Results$. We derive parameters such as age, distance modulus and extinction for a sample of 269 open clusters, selecting only low reddening objects and discarding very young clusters, for which techniques other than isochrone-fitting are more suitable for estimating ages.
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Dates et versions

hal-02005338 , version 1 (28-05-2023)

Identifiants

Citer

D. Bossini, A. Vallenari, A. Bragaglia, T. Cantat-Gaudin, R. Sordo, et al.. Age determination for 269 $Gaia$ DR2 Open Clusters. Astronomy and Astrophysics - A&A, 2019, 623, pp.A108. ⟨10.1051/0004-6361/201834693⟩. ⟨hal-02005338⟩

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