论文标题
南部恒星流谱调查（S5）：七个恒星流的化学丰度
The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams
论文作者
论文摘要
我们介绍了由南部恒星溪流光谱调查（S5）证实的七个恒星溪流中42个红色巨星的高分辨率麦哲伦/迈克光谱法：Atlas，Aliqa Uma，Chenab，Chenab，Elqui，Elqui，Indus，Indus，Jhelum和Phoenix。使用光度恒星参数和标准LTE分析，已从10,000多个单个线测量或上限中得出了30个元素的丰度。目前，这是恒星流中恒星最广泛的元素丰度。三个流（Atlas，Aliqa Uma和Phoenix）是破坏的金属贫困球状簇，尽管对于在球状簇中通常观察到的光元素的反相关性仅可见弱证据。四个溪流（Chenab，Elqui，Indus和Jhelum）是矮星的破坏，其星星显示出丰度的签名，这些签名表明祖先的祖先量从$ 10^6-10^6-10^7 m_ \ odot $不等。为分析方法提供了广泛的描述，包括推导一种新方法，用于包括恒星参数相关性对每个恒星的丰度和不确定性的影响。 本文包括与位于智利Las Campanas天文台的6.5米麦哲伦望远镜收集的数据。
We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix. Abundances of 30 elements have been derived from over 10,000 individual line measurements or upper limits using photometric stellar parameters and a standard LTE analysis. This is currently the most extensive set of element abundances for stars in stellar streams. Three streams (ATLAS, Aliqa Uma, and Phoenix) are disrupted metal-poor globular clusters, although only weak evidence is seen for the light element anticorrelations commonly observed in globular clusters. Four streams (Chenab, Elqui, Indus, and Jhelum) are disrupted dwarf galaxies, and their stars display abundance signatures that suggest progenitors with stellar masses ranging from $10^6-10^7 M_\odot$. Extensive description is provided for the analysis methods, including the derivation of a new method for including the effect of stellar parameter correlations on each star's abundance and uncertainty. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.
