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首页> 外文期刊>The Astrophysical Journal. Letters >Star-to-star iron abundance variations in red giant branch stars in the galactic globular cluster NGC 3201
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Star-to-star iron abundance variations in red giant branch stars in the galactic globular cluster NGC 3201

机译：恒星至明星钢铁丰富变化在半乳液球簇中的红巨星星星NGC 3201

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摘要

We present the metallicity as traced by the abundance of iron in the retrograde globular cluster NGC 3201, measured from high-resolution, high signal-to-noise spectra of 24 red giant branch stars. A spectroscopic analysis reveals a spread in [Fe/H] in the cluster stars at least as large as 0.4 dex. Star-to-star metallicity variations are supported both through photometry and through a detailed examination of spectra. We find no correlation between iron abundance and distance from the cluster core, as might be inferred from recent photometric studies. NGC 3201 is the lowest mass halo cluster to date to contain stars with significantly different [Fe/H] values.
机译：我们将金属性呈现为逆行球形集群NGC 3201中的铁的丰度追踪，从高分辨率，高信号噪声光谱测量的24个红色巨型分支恒星。 光谱分析显示簇恒星中的[Fe / h]涂抹，至少与0.4 dex一样大。 恒星金属化变化通过测光和通过光谱进行详细检查来支持。 我们发现钢坯与群集核心之间的距离之间没有相关性，从最近的光度研究中可能推断。 NGC 3201是迄今为止最低的质量光环集群，含有显着不同的[Fe / H]值的恒星。

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    Simmerer J.; Ivans I.I.; Filler D.; Francois P.; Charbonnel C.; Monier R.; James G.;

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    Department of Physics and Astronomy University of Utah Salt Lake City UT 84112 United States;

    Department of Physics and Astronomy University of Utah Salt Lake City UT 84112 United States;

    Department of Physics and Astronomy University of Utah Salt Lake City UT 84112 United States;

    Paris-Meudon Observatory France and Université de Picardie Jules Verne F-80080 Amiens France;

    Geneva Observatory University of Geneva Chemin des Maillettes 51 CH-1290 Versoix Switzerland;

    Laboratoire Hippolyte Fizeau Université Nice Sophia Antipolis Parc Valrose F-06000 Nice France;

    European Southern Observatory Karl-Schwarzschild-Strasse 2 D-85748 Garching bei Munchen Germany;

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  • 正文语种 eng
  • 中图分类 天体力学（理论天文学）;
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