恒星中氧化铝的A-X红外波段：寻找和新的探测
The A-X infrared bands of Aluminum Oxide in stars: search and new detections
摘要：
为了更好地了解这种自由基的特性，我们描述了对AlO的A-X红外波段的搜索。这些波段很少遇到的天文来源，但令人惊讶的是，非常突出的光谱中的两个著名的，新星般的变量（V838 Mon和V4332 Sgr），从而激励我们探索必要的物理条件，其激发。在这项研究中，我们提出了17颗恒星中的13颗恒星的光谱中的A-X波段的检测，这些恒星是根据它们的J-K颜色选择的，作为检测这些波段的潜在候选者。大部分的AlO探测是在AGB星，即9 OH/IR星，2 Mira变星和2个明亮的红外源。我们的研究表明，在低温和富氧环境中，A-X带是相当普遍的。有趣的变化的强度的AlO带在一个源（IRAS 18530+0817）的报告和原因，这是检查。讨论了AlO在氧化铝尘埃形成中的作用、A-X波段AGB星放射性$^{26}$ Al含量的估算范围以及最近发现的AlO的毫米波/射电研究的可能目标。
英文摘要：
We describe a search for the A-X infrared bands of AlO with a view to better understand the characteristics of this radical. These bands are infrequently encountered in astronomical sources but surprisingly were very prominent in the spectra of two well-known, nova-like variables (V838 Mon and V4332 Sgr) thereby motivating us to explore the physical conditions necessary for their excitation. In this study, we present the detection of A-X bands in the spectra of 13 out of 17 stars, selected on the basis of their J-K colors as potential candidates for detection of these bands. The majority of the AlO detections are in AGB stars viz. 9 OH/IR stars, 2 Mira variables and 2 bright infrared sources. Our study shows that the A-X bands are fairly prevalent in sources with low temperature and O-rich environments. Interesting variation in strength of the AlO bands in one of the sources (IRAS 18530+0817) is reported and the cause for this is examined. Possible applications of the present study are discussed in terms of the role of AlO in alumina dust formation, the scope for estimating the radioactive $^{26}$Al content in AGB stars from the A-X bands, and providing possible targets for further mm/radio studies of AlO which has recently been discovered at millimeter wavelengths.
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