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arXiv 1701.06809astro-ph.SR
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太阳光球层氧丰度的不确定性

Uncertainties in the solar photospheric oxygen abundance

M. Cubas Armas, A. Asensio Ramos, H. Socas-Navarro

摘要:

这项工作的目的是为了更好地了解来自三维模型的光球太阳氧丰度的置信限,使用禁止[OI]线在6300 ° C,包括与其他参数的相关性。我们使用了一个三维经验模型和两个太阳强度图集。我们采用贝叶斯推断作为一种工具,以确定最有可能的太阳氧丰度的值所选择的模型。我们考虑了一些误差源,如在连续推导中的不确定性,在波长校准和丰度/强度的镍。我们的研究结果表明,在推导中采用的几个参数的影响之间的相关性。贝叶斯分析提供了稳健的置信限,以严格的方式考虑了所有这些因素。我们得到,给定的经验三维模型和阿特拉斯观测在这里,太阳氧丰度的最可能的值是$\log(ε_O) = 8.86\pm0.04$。然而,我们注意到,这种不确定性没有考虑由于模型选择而导致的系统误差的可能来源。

英文摘要:

The purpose of this work is to better understand the confidence limits of the photospheric solar oxygen abundance derived from three-dimensional models using the forbidden [OI] line at 6300 Å, including correlations with other parameters involved. We worked with a three-dimensional empirical model and two solar intensity atlases. We employed Bayesian inference as a tool to determine the most probable value for the solar oxygen abundance given the model chosen. We considered a number of error sources, such as uncertainties in the continuum derivation, in the wavelength calibration and in the abundance/strength of Ni. Our results shows correlations between the effects of several parameters employed in the derivation. The Bayesian analysis provides robust confidence limits taking into account all of these factors in a rigorous manner. We obtain that, given the empirical three-dimensional model and the atlas observations employed here, the most probable value for the solar oxygen abundance is $\log(ε_O) = 8.86\pm0.04$. However, we note that this uncertainty does not consider possible sources of systematic errors due to the model choice.

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