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Title: OCCASO - II. Physical parameters and Fe abundances of red clump stars in 18 open clusters
Author: Casamiquela Floriach, Laia
Carrera, Ricardo
Blanco Cuaresma, S.
Jordi i Nebot, Carme
Balaguer Núñez, María de los Dolores
Pancino, E.
Anders, Friedrich
Chiappini, C.
Díaz Pérez, L.
Aguado, D. S.
Aparicio, A.
García Dias, R.
Heiter, U.
Martínez Vázquez, C. E.
Murabito, S.
Del Pino Gutiérrez, Amparo
Keywords: Espectroscòpia
Cúmuls de galàxies
Spectrum analysis
Clusters of galaxies
Issue Date: 1-Oct-2017
Publisher: Royal Astronomical Society
Abstract: 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 (Teff, log g, ξ), 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.
Note: Reproducció del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2017, vol. 470, num. 4, p. 4363-4381
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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