BOSSINI, D.; VALLENARI, A.; BRAGAGLIA, A.; CANTAT-GAUDIN, T.; SORDO, R.; BALAGUER-NÚÑEZ, L.; JORDI, C.; MOITINHO, A.; SOUBIRAN, C.; CASAMIQUELA, L.; CARRERA, R.; HEITER, U.

doi:10.1051/0004-6361/201834693

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Astronomy and Astrophysics - A&A. 2019, vol. 623, p. A108

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$Context$. 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.< Réduire

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Astrophysics - Solar and Stellar Astrophysics

Astrophysics - Astrophysics of Galaxies

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Age determination for 269 $Gaia$ DR2 Open Clusters

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