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arXiv 0711.4590astro-ph
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日震学与太阳丰度

Helioseismology and Solar Abundances

Sarbani Basu, H. M. Antia

摘要:

日震学使我们能够以前所未有的细节研究太阳的结构。恒星演化理论的一个成就是日震研究表明,太阳模型的结构与太阳非常相似。然而,最近对太阳重元素丰度的修订破坏了这一协议。重元素丰度决定了恒星物质的不透明度,因此是恒星模型计算的重要输入。具有新的低丰度的模型不满足日震约束。在这里,我们回顾了重元素丰度如何影响太阳模型,如何用日震学测试这些模型,以及新丰度对标准太阳模型的影响。我们还讨论了试图提高与太阳的低丰度模型的协议,并讨论如何日震学被用来确定太阳的重元素丰度。目前的文献回顾表明,试图提高低重元素丰度的太阳模型和地震推理之间的协议迄今为止一直不成功。低金属丰度模型与地震数据的分歧最小,需要改变所有输入的物理恒星模型超出其可接受的范围。太阳重元素丰度的地震测定产生的结果与更老、更高的太阳丰度值相一致,因此,不需要对太阳模型的输入进行重大修改,就可以使更高金属丰度的太阳模型与日震数据相一致。

英文摘要:

Helioseismology has allowed us to study the structure of the Sun in unprecedented detail. One of the triumphs of the theory of stellar evolution was that helioseismic studies had shown that the structure of solar models is very similar to that of the Sun. However, this agreement has been spoiled by recent revisions of the solar heavy-element abundances. Heavy element abundances determine the opacity of the stellar material and hence, are an important input to stellar model calculations. The models with the new, low abundances do not satisfy helioseismic constraints. We review here how heavy-element abundances affect solar models, how these models are tested with helioseismology, and the impact of the new abundances on standard solar models. We also discuss the attempts made to improve the agreement of the low-abundance models with the Sun and discuss how helioseismology is being used to determine the solar heavy-element abundance. A review of current literature shows that attempts to improve agreement between solar models with low heavy-element abundances and seismic inference have been unsuccessful so far. The low-metallicity models that have the least disagreement with seismic data require changing all input physics to stellar models beyond their acceptable ranges. Seismic determinations of the solar heavy-element abundance yield results that are consistent with the older, higher values of the solar abundance, and hence, no major changes to the inputs to solar models are required to make higher-metallicity solar models consistent with helioseismic data.

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