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OCCASO - II. Physical parameters and Fe abundances of red clump stars in 18 open clusters
Univ Barcelona, Dept Fis Quant & Astrofis, ICC IEEC, E-08007 Barcelona, Spain..
Inst Astrofis Canarias, E-38205 Tenerife, Spain.;Univ La Laguna, Dept Astrofis, E-38207 San Cristobal la Laguna, Spain..
Univ Geneva, Observ Geneve, CH-1290 Versoix, Switzerland..
Univ Barcelona, Dept Fis Quant & Astrofis, ICC IEEC, E-08007 Barcelona, Spain..
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 470, no 4, p. 4363-4381Article in journal (Refereed) Published
Abstract [en]

Open clusters have long been used to study the chemodynamical evolution of the Galactic disc. This requires a homogeneously analysed sample covering a wide range of ages and distances. In this paper, we present the Open Clusters Chemical Abundances from Spanish Observatories (OCCASO) second data release. This comprises a sample of high-resolution (R > 65 000) and high signal-to-noise spectra of 115 red clump stars in 18 open clusters. We derive atmospheric parameters (T-eff, log g, xi), and [Fe/H] abundances using two analysis techniques: equivalent widths and spectral synthesis. A detailed comparison and a critical review of the results of the two methods are made. Both methods are carefully tested between them, with the Gaia FGK benchmark stars, and with an extensive sample of literature values. We perform a membership study using radial velocities and the resulting abundances. Finally, we compare our results with a chemodynamical model of the Milky Way thin disc concluding that the oldest open clusters are consistent with the models only when dynamical effects are taken into account.

Place, publisher, year, edition, pages
2017. Vol. 470, no 4, p. 4363-4381
Keywords [en]
techniques: spectroscopic, Galaxy: disc, open clusters and associations: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-334394DOI: 10.1093/mnras/stx1481ISI: 000408207600043OAI: oai:DiVA.org:uu-334394DiVA, id: diva2:1163927
Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2017-12-08Bibliographically approved

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Heiter, Ulrike
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