OH17 7 -2.0中OH脉泽爆发的EVN观测
EVN observations of an OH maser burst in OH17.7-2.0
摘要：
我们观测到了OH 1612-MHz脉泽辐射，朝向2003年经历了一次非常强烈和不寻常的爆发的原行星状星云候选者OH 17.7 -2.0。用EVN获得了相位参考数据，以便定位爆发并检查其可能的原因。大部分的发射来自一个不完整的球壳与内，外半径分别为220和850质量。有一个强有力的证据表明，脉泽组件出现由于一个类似的喷流后AGB外流与残余的外部AGB壳层的相互作用。这种相互作用最显著的特征是在73.3km/s附近强烈的偏振辐射爆发，来自两个亮度温度高达10^11K的未分辨分量，它们位于距离中心恒星2500 AU的双锥区边缘。值得注意的是，这个OH双锥区域与从近红外图像推断的极地外流很好地对齐。
英文摘要：
We have observed the OH 1612-MHz maser emission towards the proto-planetary nebula candidate OH17.7-2.0 that underwent a very strong and unusual outburst in 2003. Phase-referencing data were obtained with the EVN in order to localize the outburst and to examine its possible causes. The majority of the emission comes from an incomplete spherical shell with inner and outer radii of 220 and 850 mas, respectively. There is a strong evidence for maser components that arise due to the interaction of a jet-like post-AGB outflow with the remnant outer AGB shell. The most prominent signature of such an interaction is the strongly bursting polarized emission near 73.3km/s coming from two unresolved components of brightness temperature up to 10^11K located at the edge of the biconal region 2500 AU from the central star. It is remarkable that this OH biconal region is well-aligned with the polar outflow inferred from the near-infrared image.
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