论文标题
使用Sofia/Flitecam从行星星云中对3至5.4微米发射的调查
A Survey of 3 to 5.4 Micron Emission From Planetary Nebulae using SOFIA/FLITECAM
论文作者
论文摘要
Here we present the results of an airborne 3-5.4$μ$m spectroscopic study of three young, Carbon-rich planetary nebulae IC 5117, PNG 093.9-00.1, and BD $+$30 3639. These observations were made using the grism spectroscopy mode of the FLITECAM instrument during airborne science operations onboard NASA's Stratospheric Observatory for Infrared Astronomy （索非亚）。这项研究的目的是表征行星星云中的3.3 $ $ m和5.25 $ $ m pAH粉尘的发射，并研究进化恒星中PAH特征的演变，然后它们将其纳入星形形成区域的新恒星系统。从IRA，KAO和ISO源列表中选择了目标，并在Lick天文台的3米Shane望远镜上使用FliteCam观察到目标，以允许在地面和机载观测值之间进行直接比较。我们测量PAH发射等效宽度和中心波长，对PAH发射的形状进行分类，并确定每个目标的PAH/脂肪族比率。在所有三个对象中都观察到3.3 $ $ m pAH排放功能。 PNG 093.9-00.1在3.4至3.6 $ m $ m的区域中展示了NGC 7027样脂肪族发射，而IC 5117和BD +30 3639表现出较少的脂肪族结构。这三个PNs均以5.25 $μm的速度显示PAH排放。
Here we present the results of an airborne 3-5.4$μ$m spectroscopic study of three young, Carbon-rich planetary nebulae IC 5117, PNG 093.9-00.1, and BD $+$30 3639. These observations were made using the grism spectroscopy mode of the FLITECAM instrument during airborne science operations onboard NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA). The goal of this study is to characterize the 3.3 $μ$m and 5.25 $μ$m PAH dust emission in planetary nebulae and study the evolution of PAH features within evolved stars before their incorporation into new stellar systems in star-forming regions. Targets were selected from IRAS, KAO and ISO source lists, and were previously observed with FLITECAM on the 3-meter Shane telescope at Lick Observatory to allow direct comparison between the ground and airborne observations. We measure PAH emission equivalent width and central wavelength, classify the shape of the PAH emission, and determine the PAH/Aliphatic ratio for each target. The 3.3 $μ$m PAH emission feature is observed in all three objects. PNG 093.9-00.1 exhibits NGC 7027-like aliphatic emission in the 3.4 to 3.6 $μ$m region while IC 5117 and BD +30 3639 exhibit less aliphatic structure. All three PNs additionally exhibit PAH emission at 5.25 $μ$m.
