论文标题
使用HEI线的离子化区域的星际灭绝校正
Interstellar extinction correction in ionised regions using HeI lines
论文作者
论文摘要
对数灭绝系数C（H $β$）通常使用案例B重组的H $α$/H $β$比率得出，并假定电子密度和温度的标准值。然而，在研究具有不同表面亮度的区域（例如扩展的星云），使用单个积分磁场观测值时，使用强的balmer线可能会导致选择偏见，因为在某些情况下，H $α$线可以以中等至长的暴露量饱和。在这项工作中，我们提出了一种仅基于HEI弱线来得出灭绝校正的方法，考虑到这些原子中三胞胎状态的存在及其对重组线的影响。我们已经应用了此程序来计算Muse Intemalel-Field光谱数据的30个doradus星云的不同区域的灭绝。发现氦气和氢C（H $β$）测定之间的比较可以在误差中完全兼容结果，同时使用两组线可大大降低派生中的误差。
The logarithmic extinction coefficient, c(H$β$), is usually derived using the H$α$/H$β$ ratio for case B recombination and assuming standard values of electron density and temperature. However, the use of strong Balmer lines can lead to selection biases when studying regions with different surface brightness, such as extended nebulae, with the use of single integral field spectroscopy observations, since, in some cases, the H$α$ line can be saturated in moderate to long exposures. In this work, we present a method to derive extinction corrections based only on the weaker lines of HeI, taking into account the presence of triplet states in these atoms and its influence on recombination lines. We have applied this procedure to calculate the extinction of different regions of the 30 Doradus nebula from MUSE integral-field spectroscopy data. The comparison between helium and hydrogen c(H$β$) determinations has been found to yield results fully compatible within the errors and the use of both sets of lines simultaneously reduces considerably the error in the derivation.
