Electron-Density-dependent Extreme-Ultraviolet Intensity Ratios from L-Shell Iron Ions in the Frascati Tokamak Upgrade
Electron-Density-dependent Extreme-Ultraviolet Intensity Ratios from L-Shell Iron Ions in the Frascati Tokamak Upgrade
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DOI：
10.1086/323371
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发表时间：
2001-11
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影响因子：
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通讯作者：
K. Fournier;M. May;D. Liedahl;D. Pacella;M. Finkenthal;M. Leigheb;M. Mattioli;W. Goldstein
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文献类型：
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作者：
K. Fournier;M. May;D. Liedahl;D. Pacella;M. Finkenthal;M. Leigheb;M. Mattioli;W. Goldstein
我们测量了Frascati托卡马克升级等离子体中高电荷态L壳层铁离子的密度敏感极紫外线比，密度比以前观测到的高2倍以上。这些观测直接适用于最近对大熊座W双星和大力神DQ类激变变星大气高密度区辐射的测量。我们将我们的观测结果与使用HULLAC程序套件计算的大型原子结构数据集的碰撞-辐射模型进行了比较。我们发现，几乎所有光谱混合不会损害我们的数据的情况下都有很好的一致性。我们还将我们的HULLAC模型的预测与Brickhouse，Raymond，&Smith代码给出的比率进行了比较；我们发现，无论原子模型的大小如何，两种计算结果的一致性都好于20%。我们的结果证实了在44i Boö和ex Hya的日冕中观察到了非常高的电子密度(>；1014 cm-3)。
We present measurements of density-sensitive extreme-ultraviolet line ratios from highly charged L-shell iron ions in the Frascati Tokamak Upgrade plasma at densities more than a factor of 2 higher than previously observed. These observations are directly applicable to recent measurements of emission from high-density regions of the atmospheres of W Ursae Majoris binary stars and DQ Herculis type cataclysmic variables. We compare our observations to collisional-radiative models with large atomic structure data sets computed with the HULLAC suite of codes. We find good agreement for nearly all cases where spectral blending does not compromise our data. We also compare the predictions of our HULLAC models with ratios given by the Brickhouse, Raymond, & Smith code; we find agreement to better than 20% between the two calculations independent of the size of the atomic model. Our results confirm observations of very high electron densities (>1014 cm-3) in the coronae of 44i Boö and EX Hya.