文章基本信息

标题：Age determination for 269 Gaia DR2 open clusters ⋆
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作者：D. Bossini ; A. Vallenari ; A. Bragaglia 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：623
DOI：10.1051/0004-6361/201834693
语种：English
出版社：EDP Sciences
摘要：Context. TheGaiaSecond 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 better understanding of the disk properties.Aims. The aim of the paper is to improve the knowledge of cluster parameters, using only the unprecedented quality of theGaiaphotometry and astrometry.Methods. We have made use of the membership determination based on the preciseGaiaastrometry and photometry. We applied an automated Bayesian tool, BASE-9, to fit stellar isochrones on the observedG,GBP,GRPmagnitudes 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.
关键词：enmethods: statisticalopen clusters and associations: generalGalaxy: stellar contentcatalogs