Issue |
A&A
Volume 598, February 2017
|
|
---|---|---|
Article Number | A68 | |
Number of page(s) | 18 | |
Section | Galactic structure, stellar clusters and populations | |
DOI | https://doi.org/10.1051/0004-6361/201629345 | |
Published online | 01 February 2017 |
The Gaia-ESO Survey: the inner disk, intermediate-age open cluster Trumpler 23
1 Department of Astronomy, Indiana University, Bloomington, IN, USA
e-mail: joverbee@indiana.edu
2 INAF–Osservatorio Astronomico di Bologna, via Ranzani, 1, 40127 Bologna, Italy
3 Dipartimento di Fisica e Astronomia, via Ranzani, 1, 40127 Bologna, Italy
4 Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
5 Massachusetts Institute of Technology, Kavli Institute of Astrophysics & Space Research, Cambridge, MA, USA
6 Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, 15784 Athens, Greece
7 INAF–Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, 35122 Padova, Italy
8 INAF–Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125 Florence, Italy
9 Dipartimento di Fisica e Astronomia, Universita di Padova, vicolo Osservatorio 3, 35122 Padova, Italy
10 Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108 Vilnius, Lithuania
11 Centro de Astrobiología (INTA-CSIC), Departamento de Astrofísica, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
12 Suffolk University, Madrid Campus, C/ Valle de la Viña 3, 28003 Madrid, Spain
13 INAF–Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
14 Departamento de Astronomía, Casilla 160-C, Universidad de Concepción, Concepción, Chile
15 European Southern Observatory, Alonso de Cordova 3107 Vitacura, Santiago de Chile, Chile
16 Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Plaza San Juan 1, 44001 Teruel, Spain
17 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
18 Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK
19 INAF–Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
20 ASI Science Data Center, via del Politecnico SNC, 00133 Roma, Italy
21 Instituto de Física y Astronomía, Universidad de Valparaiíso, Chile
22 Instituto de Astrofísica de Andalucía-CSIC, Apdo. 3004, 18080 Granada, Spain
23 Núcleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
24 Departamento de Ciencias Fisicas, Universidad Andres Bello, Republica 220, Santiago, Chile
25 Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
26 IAASARS, National Observatory of Athens, 15236 Penteli, Greece
Received: 20 July 2016
Accepted: 7 October 2016
Context. Trumpler 23 is a moderately populated, intermediate-age open cluster within the solar circle at a RGC ~ 6 kpc. It is in a crowded field very close to the Galactic plane and the color–magnitude diagram shows significant field contamination and possible differential reddening; it is a relatively understudied cluster for these reasons, but its location makes it a key object for determining Galactic abundance distributions.
Aims. New data from the Gaia-ESO Survey enable the first ever radial velocity and spectroscopic metallicity measurements for this cluster. We aim to use velocities to isolate cluster members, providing more leverage for determining cluster parameters.
Methods. Gaia-ESO Survey data for 167 potential members have yielded radial velocity measurements, which were used to determine the systemic velocity of the cluster and membership of individual stars. Atmospheric parameters were also used as a check on membership when available. Literature photometry was used to re-determine cluster parameters based on radial velocity member stars only; theoretical isochrones are fit in the V, V−I diagram. Cluster abundance measurements of ten radial-velocity member stars with high-resolution spectroscopy are presented for 24 elements. These abundances have been compared to local disk stars, and where possible placed within the context of literature gradient studies.
Results. We find Trumpler 23 to have an age of 0.80 ± 0.10 Gyr, significant differential reddening with an estimated mean cluster E(V−I) of 1.02+0.14-0.09, and an apparent distance modulus of 14.15 ± 0.20. We find an average cluster metallicity of [Fe/H] = 0.14 ± 0.03 dex, a solar [α/Fe] abundance, and notably subsolar [s-process/Fe] abundances.
Key words: Galaxy: formation / Galaxy: abundances / Galaxy: disk / open clusters and associations: individual: Trumpler 23 / stars: abundances
© ESO, 2017
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