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http://hdl.handle.net/20.500.12386/29644
Titolo: | Age determination for 269 Gaia DR2 open clusters | Autori: | Bossini, D. VALLENARI, Antonella BRAGAGLIA, Angela Cantat-Gaudin, T. SORDO, ROSANNA Balaguer-Núñez, L. Jordi, C. Moitinho, A. Soubiran, C. Casamiquela, L. CARRERA, JIMENEZ RICARDO JESUS Heiter, U. |
Data pubblicazione: | 2019 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 623 | Da pagina:: | A108 | Abstract: | 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. <BR /> 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. <BR /> 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<SUB>BP</SUB>, G<SUB>RP</SUB> magnitudes of the high probability member stars. <BR /> 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. <P />Full Tables A.1-A.3 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/623/A108">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/623/A108</A> | URI: | http://hdl.handle.net/20.500.12386/29644 | URL: | https://www.aanda.org/articles/aa/full_html/2019/03/aa34693-18/aa34693-18.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201834693 | Bibcode ADS: | 2019A&A...623A.108B | Fulltext: | open |
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