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Chemical Composition of a Kinematically Identified Stellar Group in the Milky Way

机译:运动学确定的银河系恒星基团的化学组成

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We present the preliminary results of a project aimed at high resolution spectral analysis of stars in a kinematically identified stellar group, suspected to belong to a remnant of a disrupted satellite galaxy. The 16 stars analysed by now have a metallicity around -0.7 dex, an average isochrone age of about 12 Gyr, their chemical composition is homogeneous and distinct from the Galactic disk dwarfs. This provides further evidence of their common and maybe extragalactic origin.
机译:我们介绍了一项旨在对运动学确定的恒星组中的恒星进行高分辨率光谱分析的项目的初步结果,这些恒星组怀疑属于卫星星系残骸的残余。现在分析的16颗恒星的金属度约为-0.7 dex,平均等时线年龄约为12 Gyr,它们的化学成分是均质的,与银河系盘状矮星不同。这为它们的共同起源和河外起源提供了进一步的证据。

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    Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108, Vilnius, Lithuania;

    Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108, Vilnius, Lithuania;

    Niels Bohr Institute, Copenhagen University, Juliane Maries Vej 30, DK-2100, Copenhagen,Denmark;

    Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108, Vilnius, Lithuania;

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  • 正文语种 eng
  • 中图分类 天文学;
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