Volume 603, July 2017
|Number of page(s)||6|
|Published online||19 July 2017|
Chemical composition of the stellar cluster Gaia1: no surprise behind Sirius⋆
1 Dipartimento di Fisica e Astronomia, Università degli Studi di Bologna, Viale Berti Pichat, 6/2, 40127 Bologna, Italy
2 INAF−Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
3 Departamento de Ciencias Fisicas, Universidad Andres Bello, Fernandez Concha 700, Las Condes, Santiago, Chile
4 GEPI, Observatoire de Paris, PSL Research University, CNRS, Place Jule Janssen, 92190 Meudon, France
5 European Southern Observatory, Alonso de Cordova 4860, Macul, Santiago, Chile
Received: 19 April 2017
Accepted: 3 June 2017
We observed six He-clump stars of the intermediate-age stellar cluster Gaia1 with the MIKE/Magellan spectrograph. A possible extra-galactic origin of this cluster, recently discovered thanks to the first data release of the ESA Gaia mission, has been suggested, based on its orbital parameters. Abundances for Fe, α, proton- and neutron-capture elements have been obtained. We find no evidence of intrinsic abundance spreads. The iron abundance is solar ([FeI/H] = + 0.00 ± 0.01; σ = 0.03 dex). All the other abundance ratios are generally solar-scaled, similar to the Galactic thin disk and open cluster stars of similar metallicity. The chemical composition of Gaia1 does not support an extra-galactic origin for this stellar cluster, which can be considered as a standard Galactic open cluster.
Key words: stars: abundances / techniques: spectroscopic / open clusters and associations: individual: Gaia1
The full Table A.1 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/603/L7
© ESO, 2017
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