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Title: The OCCASO survey: presentation and radial velocities of 12 Milky Way open clusters
Author: Casamiquela Floriach, Laia
Carrera, Ricardo
Jordi i Nebot, Carme
Balaguer Núñez, María de los Dolores
Pancino, E.
Hidalgo, S. L.
Martínez Vázquez, C. E.
Murabito, S.
Del Pino Gutiérrez, Amparo
Aparicio, A.
Blanco Cuaresma, S.
Gallart, C.
Keywords: Espectroscòpia astronòmica
Cúmuls de galàxies
Via Làctia
Astronomical spectroscopy
Clusters of galaxies
Milky Way
Issue Date: 21-May-2016
Publisher: Royal Astronomical Society
Abstract: Open clusters (OCs) are crucial for studying the formation and evolution of the Galactic disc. However, the lack of a large number of OCs analysed homogeneously hampers the investigations about chemical patterns and the existence of Galactocentric radial and vertical gradients, or an age-metallicity relation. To overcome this, we have designed the Open Cluster Chemical Abundances from Spanish Observatories (OCCASO) survey. We aim to provide homogeneous radial velocities, physical parameters and individual chemical abundances of six or more red clump stars for a sample of 25 old and intermediate-age OCs visible from the Northern hemisphere. To do so, we use high-resolution spectroscopic facilities (R >= 62 000) available at Spanish observatories. We present the motivation, design and current status of the survey, together with the first data release of radial velocities for 77 stars in 12 OCs, which represents about 50 per cent of the survey. We include clusters never studied with high-resolution spectroscopy before (NGC 1907, NGC 6991, NGC 7762), and clusters in common with other large spectroscopic surveys like the Gaia-ESO Survey (NGC 6705) and Apache Point Observatory Galactic Evolution Experiment (NGC 2682 and NGC 6819). We perform internal comparisons between instruments to evaluate and correct internal systematics of the results, and compare our radial velocities with previous determinations in the literature, when available. Finally, radial velocities for each cluster are used to perform a preliminary kinematic study in relation with the Galactic disc.
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It is part of: Monthly Notices of the Royal Astronomical Society, 2016, vol. 458, num. 3, p. 3150-3167
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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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