LOW-TEMPERATURE ROSSELAND OPACITIES
LOW-TEMPERATURE ROSSELAND OPACITIES
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DOI：
10.1086/175039
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发表时间：
1994-12-20
影响因子：
4.9
通讯作者：
FERGUSON, JW
中科院分区：
文献类型：
--
作者：
ALEXANDER, DR;FERGUSON, JW
一个新的，全面的低温不透明度数据集已经组装。从这个基本的数据集，Rosseland和普朗克平均不透明度计算温度在12,500和700 K之间。除了通常的连续吸收体，原子线吸收（超过800万线），分子线吸收（近6000万线），以及颗粒吸收和散射（由硅酸盐，铁，碳和SiC）已经占。由于线的吸收计算单色，并包括在平均值与不透明度采样技术。假设颗粒与气体处于化学平衡状态，并形成连续分布的椭球体，这些不透明度与最近其他温度高于5000 K的不透明度表的一致性非常好。它表明，不透明度，忽略分子变得不可靠的温度低于5000 K。三原子分子在3200 K时成为重要的吸收体。同样，在温度低于1700 K时，计算中必须包括晶粒。
A new, comprehensive set of low-temperature opacity data has been assembled. From this basic data set, Rosseland and Planck mean opacities have been computed for temperatures between 12,500 and 700 K. In addition to the usual continuous absorbers, atomic line absorption (with more than 8 million lines), molecular line absorption (with nearly 60 million lines), and grain absorption and scattering (by silicates, iron, carbon, and SiC) have been accounted for. The absorption due to lines is computed monochromatically and included in the mean with the opacity sampling technique. Grains are assumed to form in chemical equilibrium with the gas and to form into a continuous distribution of ellipsoids.Agreement of these opacities with other recent tabulations of opacities for temperatures above 5000 K is excellent. It is shown that opacities which neglect molecules become unreliable for temperatures below 5000 K. Triatomic molecules become important absorbers at 3200 K. Similarly, grains must be included in the computation for temperatures below 1700 K.