Herbig Ae星周围的雾云：H2O谱线的理论研究
The Foggy Disks Surrounding Herbig Ae Stars: a Theoretical Study of the H2O Line Spectra
摘要：
水是许多天体物理环境中的关键物质，但在原行星盘中尤为重要。到目前为止，这些物体中的水的观测很少，但由于赫歇尔卫星，情况很快就会改变。我们在这里报告的水线光谱的原行星盘周围的Ae星的理论研究。我们表明，几条线将与HIFI仪器船上的赫歇尔空间天文台观察。我们预测，一些脉泽线也可以观察到地面望远镜，我们讨论如何预测不仅取决于所采用的物理和化学模型，但也对一组碰撞系数使用和H2的邻位对位比通过其碰撞激发的影响。这使得水线观测成为一个强大的，但危险的-如果滥用-诊断工具。
英文摘要：
Water is a key species in many astrophysical environments, but it is particularly important in proto-planetary disks. So far,observations of water in these objects have been scarce, but the situation should soon change thanks to the Herschel satellite. We report here a theoretical study of the water line spectrum of a proto-planetary disk surrounding Ae stars. We show that several lines will be observable with the HIFI instrument onboard the Herschel Space Observatory. We predict that some maser lines could also be observable with ground telescopes and we discuss how the predictions depend not only on the adopted physical and chemical model but also on the set of collisional coefficients used and on the H2 ortho to para ratio through its effect on collisional excitation. This makes the water lines observations a powerful, but dangerous -if misused- diagnostic tool.
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