Chemical composition of the stellar cluster Gaia1: No surprise behind Sirius

Chemical composition of the stellar cluster Gaia1: No surprise behind Sirius
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盖亚1星团的化学成分：天狼星背后并不奇怪

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发表时间：
2017
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通讯作者：
I. Saviane
I. Saviane
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作者：
A. Mucciarelli;L. Monaco;P. Bonifacio;I. Saviane

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我们用麦哲伦/ MIKE光谱仪观测了6颗中等年龄星团Gaia1中的he - cluster恒星。最近，欧空局盖亚任务首次发布的数据发现了这个星系团的一个可能的星系外起源，根据它的轨道参数，已经提出了一个建议。得到了铁、α、质子和中子捕获元素的丰度。我们没有发现内在富足会扩散的证据。铁丰度与太阳相似（[FeI/H] = + 0.00±0.01;σ = 0.03指数）。所有其他的丰度比一般都是太阳的尺度，类似于银河系薄盘和类似金属丰度的疏散星团。盖亚1的化学成分不支持这个恒星团的星系外起源，它可以被认为是一个标准的银河系疏散星团。
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.