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arXiv 2602.14294astro-ph.SRastro-ph.GA
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Gaia FGK基准星:选择近红外线用于丰度确定

Gaia FGK Benchmark Stars: Selecting Infrared Lines for Abundance Determination

Instituto de Estudios Astrofísicos, Facultad de Ingeniería y Ciencias, Universidad Diego Portales(Diego Portales大学工程与科学学院天体物理研究所);Departamento de Física, Universidad de Santiago de Chile(智利圣地亚哥大学物理系);Instituto de Astrofísica, Pontificia Universidad Católica de Chile(智利天主教Pontificia大学天体物理研究所);Gran Telescopio CANARIAS(加那利大型望远镜);Instituto de Astrofísica de Canarias(加那利天体物理研究所);Center for Interdisciplinary Research in Astrophysics and Space Exploration (CIRAS), Universidad de Santiago de Chile(智利圣地亚哥大学星际交叉研究天文与空间探索中心);Observational Astrophysics, Department of Physics and Astronomy, Uppsala University(乌普萨拉大学物理与天文系观测天体物理学);LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS(巴黎天文台、PSL大学、索邦大学、巴黎西岱大学、CY塞尔吉巴黎大学、法国国家科学研究中心LIRA);Instituto de Astrofísica, Pontif(天体物理研究所)

Scarlet Elgueta, Paula Jofré, Claudia Aguilera-Gómez, Ditte Slumstrup, Álvaro Rojas-Arriagada, Ulrike Heiter, Laia Casamiquela, Manuela Zoccali, Clare Worley, Caroline Soubiran

AI总结:

本文基于实验室原子数据,选取Gaia FGK基准星的近红外线,通过合成光谱分析,确定了在Y、J和H波段中稳定的原子吸收线,为近红外线验证提供了可靠方法。

摘要:

新且更强大的近红外光谱仪的出现显著推动了原子和分子线列表及恒星大气模型的研究。尽管光学丰度确定依赖于广泛验证的线列表和建模框架,但近红外测量仍面临更大的不确定性,主要受大气模型选择和可用原子数据质量的影响。本文旨在基于实验室原子数据,提供一个同质且可重复的原子吸收线集,在Y、J和H波段(9800 - 18000(埃))。我们分析了六颗Gaia FGK基准星的CRIRES光谱,覆盖有效温度、表面重力和化学组成广泛的范围。通过使用基准恒星参数计算合成光谱,并通过定量序列独立评估每个跃迁,在每颗星中检查线深度、饱和、混叠(纯度)以及观测与合成线轮廓的一致性。我们识别出在这些波段中保持一致的稳定原子跃迁,这些跃迁在我们样本中表示的全部恒星参数范围内保持一致。如Mg I、Si I和Ca I等α元素的跃迁,以及若干Fe I跃迁,均满足所有稳健性标准。在探索的中子捕获物种中,只有Sr II提供了持续满足我们要求的跃迁。除了接受的跃迁列表外,本研究展示了完全定量的多标准框架为近红外线验证提供了透明且可重复的基础,随着实验室数据、恒星大气模型和仪器的不断改进。

英文摘要:

The advent of new and more powerful infrared spectrographs has significantly motivated the advancement of the study of atomic and molecular line lists and stellar atmosphere models. While optical abundance determinations rely on extensively validated line lists and modeling frameworks, infrared measurements still face larger uncertainties, largely driven by the choice of atmospheric models and the quality of the available atomic data. In this work, we aim to deliver a homogeneous and reproducible set of atomic absorption lines in the Y, J, and H bands (9800 - 18000 (Angstrom)), based exclusively on laboratory atomic data. We analyse CRIRES spectra of six Gaia FGK Benchmark Stars spanning a wide range in effective temperature, surface gravity, and chemical composition. Synthetic spectra are computed using the benchmark stellar parameters, and each transition is evaluated independently in every star through a quantitative sequence that examines line depth, saturation, blending (purity), and the agreement between observed and synthetic line profiles. We identify a set of robust atomic transitions in these bands that remain consistent across the full range of stellar parameters represented in our sample. Lines of alpha-elements such as Mg I, Si I, and Ca I, together with several Fe I transitions, satisfy all robustness criteria. Among the neutron-capture species explored, only Sr II provides lines that consistently meet our requirements. Beyond the specific list of accepted transitions, this study demonstrates that a fully quantitative, multi-criteria framework provides a transparent and reproducible foundation for near-infrared line validation as laboratory data, stellar atmosphere models, and instrumentation continue to improve.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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