论文标题
在进化星的信封中搜索光氢化物
A Search for Light Hydrides in the Envelopes of Evolved Stars
论文作者
论文摘要
我们报告了沿视线沿着IRC+10216和Vy Canis Majoris的化学富含室外信封的硅藻SiH，pH和FEH的搜索。人们认为这些分子在这些恒星的光角附近的高温区域形成，然后可能通过气相和尘土相互作用进一步反应，导致更复杂的物种，但尚未受到观察的限制。我们使用索非亚上的大光谱仪在四个光谱窗口中搜索这些分子的旋转发射线，范围从600 GHz到1500 GHz。尽管在我们的搜索中未检测到靶向物种，但我们报告了它们在每个来源中的上限丰度，并讨论它们如何影响密集的室内介质中对氢化物化学的当前理解。我们将这些氢化物的非探测归因于它们的紧凑源大小，高屏障形成和倾向与风中的其他分子反应。
We report a search for the diatomic hydrides SiH, PH, and FeH along the line of sight toward the chemically rich circumstellar envelopes of IRC+10216 and VY Canis Majoris. These molecules are thought to form in high temperature regions near the photospheres of these stars, and may then further react via gas-phase and dust-grain interactions leading to more complex species, but have yet to be constrained by observation. We used the GREAT spectrometer on SOFIA to search for rotational emission lines of these molecules in four spectral windows ranging from 600 GHz to 1500 GHz. Though none of the targeted species were detected in our search, we report their upper limit abundances in each source and discuss how they influence the current understanding of hydride chemistry in dense circumstellar media. We attribute the non-detections of these hydrides to their compact source sizes, high barriers of formation, and proclivity to react with other molecules in the winds.
