2017
DOI: 10.1051/0004-6361/201731009
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Chemical composition of the stellar cluster Gaia1: no surprise behind Sirius

Abstract: 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 abundanc… Show more

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Cited by 18 publications
(27 citation statements)
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“…The uncertainties in the chemical abundances were obtained as discussed in e.g. Mucciarelli et al (2017). For those elements for which abundances have been measured using EWs, the random errors are computed as the dispersion of the mean normalized to the root mean square of the number of used lines.…”
Section: Discussionmentioning
confidence: 99%
“…The uncertainties in the chemical abundances were obtained as discussed in e.g. Mucciarelli et al (2017). For those elements for which abundances have been measured using EWs, the random errors are computed as the dispersion of the mean normalized to the root mean square of the number of used lines.…”
Section: Discussionmentioning
confidence: 99%
“…Targets for our spectroscopy were selected from the Two Micron All Sky Survey (2MASS) catalog (Cutri et al 2003) within an identical, fiducial spatial selection region as in Koposov et al (2017, see Hertzsprung-Russell diagram, constructed from our best spectroscopic stellar parameters. Our targets are highlighted in blue, red triangles are the He-clump targets of Mucciarelli et al (2017), and the sample of Simpson et al (2017) is shown in black. Either panel also displays Dartmouth isochrones (Dotter et al 2008) using an age (6.3 Gyr) and metallicity (−0.7 dex), as suggested by Koposov et al (2017, dashed line), and one with 12 Gyr and −0.65 dex (solid line).…”
Section: Observationsmentioning
confidence: 99%
“…Further investigation of Gaia 1 found a metallicity higher by more than 0.5 dex, which challenged the previous age measurement and rather characterized it as a young (3 Gyr), metalrich (−0.1 dex) object, possibly of extragalactic origin given its orbit that leads it up to ∼1.7 kpc above the disk (Simpson et al 2017). Subsequently, Mucciarelli et al (2017) measured chemical abundances of six stars in Gaia 1, suggesting an equally high metallicity, but based on their abundance study, the suggestion of an extragalactic origin was revoked. While a more metal-rich nature found by the latter authors conformed with the results by Simpson et al (2017), the evolutionary diagrams of both studies are very dissimilar and could not be explained by one simple isochrone fit.…”
Section: Introductionmentioning
confidence: 99%
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“…This family of stellar clusters continues to expand with deep imaging surveys (e.g., discoveries by Koposov et al 2007;Kurtev et al 2008;Balbinot et al 2013;Koposov et al 2015;Kim et al 2016;Minniti et al 2017;Froebrich 2017), and already data from the space-based Gaia astrometry mission has facilitated the detection of Gaia 1 & 2, two large, previously unknown clusters (Koposov et al 2017;Simpson et al 2017b;Mucciarelli et al 2017;Koch et al 2018). Gaia not only allows us to find over-densities on the two-dimensional plane of the sky, but also in the 5D spatial-dynamic space (Andrews et al 2017;Oh et al 2017).…”
Section: Introductionmentioning
confidence: 99%