标题： 从ISO和HST数据看NGC 6543的物理条件以及温度图的陷阱 显示英文标题

标题： Physical conditions in NGC 6543 from ISO and HST data and the pitfalls of temperature maps

摘要： 我们确定了NGC 6543中的物理条件，得到了电子温度（T_e）的两个不同估计值和电子密度（N_e）的一个估计值。 电子温度通过[O III]比值λ 5007/λ 4363以及结合λ 5007与[O III]红外线52μm和88μm的诊断图来计算。 在狭缝光谱上测得的连续辐射强度远高于最简单假设下理论预测的值。 经过考虑几种可能性后，我们认为增强的双光子发射是最可能的额外连续辐射来源。 虽然诊断图得出的T_e和N_e与最近的测定结果一致，但由λ 5007/λ 4363得出的T_e比之前发表的值小，这可能是由于由连续辐射不确定性引入的λ 4363偏差所致。 我们的主要结论是，目前的数据无法准确地推导出光致电离星云的温度分布图。 显示英文摘要

摘要： We determine the physical conditions in NGC 6543, obtaining two different estimates of the electron temperature (T_e) and one estimate of the electron density (N_e). The electron temperature is computed by means of the [O III] ratio lambda 5007/lambda 4363, and of the diagnostic diagram combining lambda 5007 to the [O III] infrared lines 52m and 88m. The continuum intensity measured on slit spectra is much higher than theoretically predicted under the simplest assumptions. After considering several possibilities, we suggest enhanced 2-photon emission as the most probable source of the additional continuum. While T_e and N_e derived from the diagnostic diagram agree with the most recent determination, T_e derived from lambda 5007/lambda 4363 is smaller than previously published values, probably due to the bias in lambda 4363 introduced by the uncertainty in the continuum. Our main conclusion is that it is not possible, with present-day data, to derive accurate temperature maps of photoionized nebulae.