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arXiv 2010.01686astro-ph.SR
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成分选择对太阳演化的影响:年龄、日震学和星震学以及中微子

The impact of composition choices on solar evolution: age, helio- and asteroseismology, and neutrinos

Diogo Capelo, Ilídio Lopes

摘要:

太阳是研究最多和最知名的恒星,因此,太阳的基本参数经常被用来弥补其他恒星知识的空白,当这些需要建模时。然而,目前可用于推断太阳内部结构的两种最强大和精确的独立方法存在分歧。我们的目标是显示在恒星的整体演化的组成选择的潜在影响,使用太阳作为一个例子。为此,我们创建了两个标准太阳模型和一个比较模型,使用金属丰度和相对元素丰度的不同组合,并比较每个模型的演化、日震和中微子相关特性。我们报告了校准到HR图中相同点的模型的年龄差异,在红巨星分支中,超过1 Gyr,并发现目前的星震测量精度水平足以区分这些模型,这些模型将显示出1.30- 2.58%的priod间距差异。我们表明,对来自碳-氮-氧循环的中微子通量进行测量,精确度约为17%,这可以通过下一代太阳中微子实验实现,有助于解决恒星丰度问题。

英文摘要:

The Sun is the most studied and well-known star, and as such, solar fundamental parameters are often used to bridge gaps in the knowledge of other stars, when these are required for modelling. However, the two most powerful and precise independent methodologies currently available to infer the internal solar structure are in disagreement. We aim to show the potential impact of composition choices in the overall evolution of a star, using the Sun as an example. To this effect, we create two Standard Solar Models and a comparison model using different combinations of metallicity and relative element abundances and compare evolutionary, helioseismic, and neutrino-related properties for each. We report differences in age for models calibrated to the same point in the HR diagram, in the red giant branch, of more than 1 Gyr, and found that the current precision level of asteroseismic measurements is enough to differentiate these models, which would exhibit differences in priod spacing of 1.30-2.58 per cent. Additionally, we show that the measurement of neutrino fluxes from the carbon-nitrogen-oxygen cycle with a precision of around 17 per cent, which could be achieved by the next generation of solar neutrino experiments, could help resolve the stellar abundance problem.

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