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Subjektives Nutzererleben in der Mensch-Computer-Interaktion Pub Date : 2018-10-01 DOI:10.2307/j.ctvddzm9x.15

G. Zasowski, Jennifer A. Johnson, P. Frinchaboy, S. Majewski, D. Nidever, H. R. Pinto, L. Girardi, B. Andrews, S. Chojnowski, K. M. Cudworth, K. Jackson, J. Munn, M. Skrutskie, R. Beaton, C. Blake, K. Covey, R. Deshpande, C. Epstein, D. Fabbian, S. Fleming, D. Hernandez, A. Herrero, S. Mahadevan, S. Mészáros, M. Schultheis, K. Sellgren, R. Terrien, J. Saders, C. A. Prieto, D. Bizyaev, A. Burton, K. Cunha, L. D. Costa, S. Hasselquist, F. Hearty, J. Holtzman, A. G. Pérez, M. G. Maia, R. O'connell, C. O'Donnell, M. Pinsonneault, B. X. Santiago, R. Schiavon, M. Shetrone, V. Smith, J. C. Wilson

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Abstract

We present a mid-infrared high spectral resolution spectrum of CRL618 in the frequency ranges 778–784 and 1227–1249 cm−1 (8.01–8.15 and 12.75–12.85 μm) taken with the Texas Echelon-cross-Echelle Spectrograph (TEXES) and the Infrared Telescope Facility (IRTF). We have identified more than 170 rovibrational lines arising from C2H2, HCN, C4H2, and C6H2. We have found no unmistakable trace of C8H2. The line profiles display a complex structure suggesting the presence of polyacetylenes in several components of the circumstellar envelope (CSE). We derive total column densities of 2.5×1017, 3.1×1017, 2.1×1017, 9.3×1016 cm−2, and 5×1016 cm−2 for HCN, C2H2, C4H2, C6H2, and C8H2, respectively. The observations indicate that both the rotational and vibrational temperatures in the innermost CSE depend on the molecule, varying from 100 to 350 K for the rotational temperatures and 100 to 500 K for the vibrational temperatures. Our results support a chemistry in the innermost CSE based on radical-neutral reactions triggered by the intense UV radiation field.

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利用德克萨斯梯队-交叉梯队光谱仪(TEXES)和红外望远镜设备(IRTF)获得了CRL618在778-784和1227-1249 cm−1(8.01-8.15和12.75-12.85 μm)频率范围内的中红外高分辨率光谱。我们已经确定了170多个由C2H2、HCN、C4H2和C6H2产生的振动谱线。我们没有发现C8H2的明显痕迹。线条轮廓显示了一个复杂的结构，表明在星周包膜(CSE)的几个组成部分存在聚乙炔。我们推导出HCN、C2H2、C4H2、C6H2和C8H2的总柱密度分别为2.5×1017、3.1×1017、2.1×1017、9.3×1016 cm−2和5×1016 cm−2。结果表明，最内层CSE的旋转温度和振动温度都与分子有关，旋转温度在100 ~ 350 K之间，振动温度在100 ~ 500 K之间。我们的研究结果支持了一种基于强紫外辐射场引发的自由基中性反应的最内层CSE化学。

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