Model test for very-metal-poor giant

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Nature Astronomy Pub Date : 2024-08-14 DOI:10.1038/s41550-024-02353-1

Paul Woods

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极贫金属巨人模型试验

由于缺乏合适的观测数据，极贫金属性恒星（-3 < [Fe/H] < -2）的天震行为没有得到很好的约束，它们的基本性质（如年龄或质量）通常是根据太阳，利用全局振荡参数来缩放的。测试这种比例关系非常重要，尤其是因为即使对于近太阳金属性恒星，也发现了比例关系的不一致和修正。Daniel Huber 及其同事报告了对开普勒振荡红巨星样本中少量贫金属恒星的光谱调查，并在银河晕中发现了一颗[Fe/H] = -2.66的极贫金属恒星。通过对这颗恒星进行详细建模，得出其年龄为 12.0 ± 1.0 Gyr，不同模型之间具有极好的一致性。这颗名为 KIC 814490 的恒星是一颗低照度红巨星，由于振荡振幅本身较低，因此频率建模具有挑战性。然而，值得注意的是，在开普勒观测中发现了高信噪比振荡，当用六种恒星结构和大气模型（BeSPP、BASTA 和 MESA 的四种处方）进行建模时，发现恒星年龄和质量的差异在 2-3% 的水平。

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Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

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19.50

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2.80%

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252

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