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Solar Forbidden Oxygen, Revisited

机译:再谈太阳能禁止氧气

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Recent large reductions in the solar oxygen abundance, based on synthesis of photospheric O I, OH, and CO absorptions with 3D convection models, have provoked consternation in the helioseismology community: the previous excellent agreement between measured p-mode oscillation frequencies and predictions based on the recommended ε_O of a decade ago (680 parts per million [ppm] relative to hydrogen) unravels at the new low value (460 ppm). In an attempt to reconcile these conflicting results, the formation of pivotal [O I] λ 6300, which is blended with a weak Ni i line, has been reconsidered, exploiting an alternative 3D model (albeit only a single temporal snapshot). And while there are several areas of agreement with the earlier [O I] studies of Allende Prieto, Asplund, and others, there is one crucial point of disagreement: the ε_O derived here is significantly larger, 650 ± 65 ppm (although at the expense of a ~30% weaker Ni I line than expected from the recommended nickel abundance). One innovation is a more robust treatment of the solar wavelengths: the balance between the components of the [O I] + Ni I blend is sensitive to velocity errors of only a few hundred m s~(-1). A second improvement is enforcement of a "continuum calibration" to ensure a self-consistent 3D temperature scale. Because of the renewed agreement between the linchpin tracer [O I] and seismic oxygen, the proposed downward slump of the solar metallicity and the perceived "oxygen crisis" now can be said to rest on less secure footings.
机译:最近基于3D对流模型合成的光球OI,OH和CO吸收量,太阳氧丰度的大幅降低引起了地震学界的震惊:先前测得的p模振荡频率与基于P模振荡频率的预测之间的出色一致性推荐的十年前的ε_O(相对于氢为680百万分之一[ppm])以新的低值(460 ppm)分解。为了调和这些矛盾的结果,已经重新考虑了使用弱Ni i线混合的枢轴[O I]λ6300的形成,并采用了替代3D模型(尽管只有一个时间快照)。尽管与Allende Prieto,Asplund等人的早期[OI]研究在多个方面达成共识,但有一个关键的分歧点:此处得出的ε_O更大,为650±65 ppm(尽管以Ni I线比推荐的镍丰度弱了约30%)。一种创新是对太阳波长的更稳健的处理:[O I] + Ni I共混物的成分之间的平衡仅对几百毫秒(-1)的速度误差敏感。第二个改进是强制执行“连续校准”,以确保自洽的3D温度标度。由于linchpin示踪剂[O I]与地震氧气之间达成了新的协议,现在可以说,拟议的太阳金属性下降和人们认为的“氧气危机”是建立在不太安全的基础上的。

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