AI 中文总结
研究食双星AI Phoenicis，通过获取其光谱测量铁和镁丰度，与M67星团恒星比较，发现F7V恒星有元素扩散特征，可用于测试含元素扩散和混合的单星模型。
AI 中文摘要
AI Phe是一颗食双星，轨道周期为24.6天，其表面重力和有效温度可通过直接测量获得高精度和准确性的数据。我们在F7V伴星全食期间获得了K0IV恒星的高质量光谱，并使用光谱解缠技术获得了该恒星及其F7V伴星的高信噪比光谱。我们利用这些光谱测量了两颗恒星中铁和镁的丰度。我们将F7V恒星和K0IV恒星的[Fe/H]和[Mg/H]值与M67中的恒星进行比较，M67是一个与AI Phe年龄和金属丰度相似的疏散星团。我们发现，我们对[Fe/H]和[Mg/H]的测量清楚地显示了F7V恒星中元素扩散的特征。这表明AI Phe可用于测试包含元素扩散和混合的单星模型。
英文摘要
AI Phe is an eclipsing binary star with an orbital period of 24.6 days for which the surface gravity and effective temperature are known from direct measurements to very high precision and accuracy. We have obtained high-quality spectroscopy of the K0IV star during the total eclipse of the F7V companion, and also obtained spectra with a very high signal-to-noise ratio for this star and its F7V companion using the spectral disentangling technique. We have used these spectra to measure the abundances of iron and magnesium for both stars. We compare the values of [Fe/H] and [Mg/H] for the F7V star and the K0IV star to stars in M67, an open cluster of similar age and metallicity to AI Phe. We find that our [Fe/H] and [Mg/H] measurements clearly show the signature of elemental diffusion in the F7V star. This suggests that AI Phe can be used to test models of single stars that include diffusion and mixing of elements.
CommentsAccepted for publication in MNRAS. 9 pages, 5 figures
