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MESA 中扩展的 Los Alamos OPLIB 表集合:Type-1 Rosseland 平均不透明度与太阳模型

An Expanded Set of Los Alamos OPLIB Tables in MESA: Type-1 Rosseland-mean Opacities and Solar Models

Ebraheem Farag, Christopher J. Fontes, F. X. Timmes, Earl P. Bellinger, Joyce A. Guzik, Evan B. Bauer, Suzannah R. Wood, Katie Mussack, Peter Hakel, James Colga… 展开作者

Ebraheem Farag, Christopher J. Fontes, F. X. Timmes, Earl P. Bellinger, Joyce A. Guzik, Evan B. Bauer, Suzannah R. Wood, Katie Mussack, Peter Hakel, James Colgan, David P. Kilcrease, Manolo E. Sherrill, Tryston C. Raecke, Morgan T. Chidester

AI总结:

本文在 MESA 中引入覆盖四种金属丰度混合物的 1194 个 OPLIB Type-1 Rosseland 平均不透明度表,扩展参数覆盖并量化其相对 OPAL 对太阳模型的影响。

摘要:

我们提出了一组包含 1194 个 Type-1 Rosseland 平均不透明度表的数据集,覆盖四种不同的金属丰度混合物。这些新的 Los Alamos OPLIB 原子辐射不透明度表在数量上比以往任何一次不透明度表发布都多一个数量级,并且涵盖了此前不存在不透明度表的参数区间。例如,这组新的不透明度表将金属丰度范围扩展至 $Z$=10$^{-6}$ 到 $Z$=0.2,从而提高低金属丰度和高金属丰度条件下不透明度的精度;它还提高了 $Z$=10$^{-4}$ 到 $Z$=0.1 金属丰度范围内的表密度,以增强通过相邻金属丰度插值获得的不透明度的准确性;此外,它增加了氢质量分数在 $X$=0 到 $X$=0.1 之间的条目,包括 $X$=10$^{-2}$、10$^{-3}$、10$^{-4}$、10$^{-5}$、10$^{-6}$,这些条目可改进缺氢恒星的恒星模型。我们将这些新的 OPLIB 辐射不透明度表实现到 MESA 中,发现经过校准的太阳模型与此前发表的日震学和太阳中微子结果总体一致。我们发现,使用新的 1194 个 OPLIB 不透明度表与使用 126 个 OPAL 不透明度表之间的差异,在各个单独化学混合物上约为 20%–80%,在太阳对流区底部和顶部分别最高约为 8% 和 15%,在太阳核心约为 7%。我们还发现,使用不同不透明度表来源的标准太阳模型之间的差异,与改变初始丰度混合物所产生的影响相当。我们的结论是,这一新的开放获取 OPLIB 不透明度表集合并不能解决太阳建模问题,并建议研究原子辐射不透明度之外的物理机制。

英文摘要:

We present a set of 1194 Type-1 Rosseland-mean opacity tables for four different metallicity mixtures. These new Los Alamos OPLIB atomic radiative opacity tables are an order of magnitude larger in number than any previous opacity table release, and span regimes where previous opacity tables have not existed. For example, the new set of opacity tables expands the metallicity range to $Z$\,=\,10$^{-6}$ to $Z$\,=\,0.2 which allows improved accuracy of opacities at low and high metallicity, increases the table density in the metallicity range $Z$\,=\,10$^{-4}$ to $Z$\,=\,0.1 to enhance the accuracy of opacities drawn from interpolations across neighboring metallicities, and adds entries for hydrogen mass fractions between $X$\,=\,0 and $X$\,=\,0.1 including $X$\,=\,$10^{-2}, 10^{-3}, 10^{-4}, 10^{-5}, 10^{-6}$ that can improve stellar models of hydrogen deficient stars. We implement these new OPLIB radiative opacity tables in \MESA, and find that calibrated solar models agree broadly with previously published helioseismic and solar neutrino results. We find differences between using the new 1194 OPLIB opacity tables and the 126 OPAL opacity tables range from $\approx$\,20--80\% across individual chemical mixtures, up to $\approx$\,8\% and $\approx$\,15\% at the bottom and top of the solar convection zone respectively, and $\approx$\,7\% in the solar core. We also find differences between standard solar models using different opacity table sources that are on par with altering the initial abundance mixture. We conclude that this new, open-access set of OPLIB opacity tables does not solve the solar modeling problem, and suggest the investigation of physical mechanisms other than the atomic radiative opacity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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