对整个南冕座R云的近红外观测
A near-infrared survey of the entire R Corona Australis cloud
摘要：
为了了解低到中等质量的恒星形成在附近的R CrA分子云，我们试图确定恒星的内容，是近红外观测。我们得到了一个JHK波段马赛克的10 × 60弧分平方覆盖整个RCrA分子云前所未有的灵敏度。我们提出了一个大约3500个近红外源的目录比饱和极限K = 10等，达到K = 18等。我们分析了扩展源，通过检查他们的形态和点源的颜色-颜色和颜色-星等图。此外，我们比较了消光推断从近红外数据与视线尘埃排放在1.2毫米。源对高尘埃排放，但相对较低的H-K显示了一个投影mm-exces，这些来源要么立即包围冷拱星材料，或者，如果太红，是一个真正的前景对象，他们被嵌入在前面的1.2毫米发射尘埃云的层。在这两种情况下，它们最有可能与云相关联。
英文摘要：
To understand low- to intermediate-mass star-formation in the nearby R CrA molecular cloud, we try to identify the stellar content that is accessible with near-infrared observations. We obtained a JHK band mosaic of 10 x 60 arcmin square covering the entire RCrA molecular cloud with unprecedented sensitivity. We present a catalogue of about 3500 near-infrared sources fainter than the saturation limit K = 10 mag, reaching K = 18mag. We analysed the extended sources by inspecting their morphology and point sources by means of colour-colour and colour-magnitude diagrams. Additionally, we compared the extinction inferred from the NIR data with the line-of-sight dust emission at 1.2 mm. Sources towards high dust emission but relatively low H-K show a projected mm-exces; these sources are either immediately surrounded by cold circumstellar material or, if too red to be a true foreground object, they are embedded in the front layer of the 1.2 mm emitting dust cloud. In both cases they are most likely associated with the cloud.
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