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Age determination for 269 Gaia DR2 open clusters
INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy.
Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti Franques 1, E-08028 Barcelona 1, Spain.
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2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 623, article id A108Article in journal (Refereed) Published
Abstract [en]

Context

The 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 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 the Gaia photometry and astrometry.

Methods

We have made use of the membership determination based on the precise Gaia astrometry and photometry. We applied an automated Bayesian tool, BASE-9, to fit stellar isochrones on the observed G, G(BP), G(RP) 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.

Place, publisher, year, edition, pages
2019. Vol. 623, article id A108
Keywords [en]
methods: statistical, open clusters and associations: general, Galaxy: stellar content, catalogs
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-380453DOI: 10.1051/0004-6361/201834693ISI: 000460892200001OAI: oai:DiVA.org:uu-380453DiVA, id: diva2:1299859
Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-03-28Bibliographically approved

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Heiter, Ulrike

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