霜狮星云的近红外偏振
The Near-Infrared Polarization of the Pre-Planetary Nebula Frosty Leo
摘要：
我们提出了一个近红外成像偏振研究的前行星状星云：霜狮子座。观测是使用安装在墨西哥索诺拉吉列尔莫·哈罗天体物理观测台2.1米望远镜上的新偏振计POLICAN在J、H和K'波段进行的。在偏振图中观察到的最突出的结果是一个大的和明确的尘埃信封（35 \arcsec \直径的H波段）。包层中的偏振位置角特别有序，几乎平行于星云的赤道（在J和H波段）。星云呈现出一个已知的双极外流，被星云的包层完全包裹着，在双极叶内，我们发现了从$60\%$（J带）到$90\%$（K'带）的高偏振能级，偏振角呈中心对称模式。我们发现了在双极叶的边缘的超风壳的残余物，这个阶段的持续时间约为600 yrs。在星云中的偏振功能的起源是最有可能由于单次和多次散射的组合。我们的研究结果清楚地表明了新的结构，提供了新的线索，从以前的渐近巨星分支阶段的演变霜狮子座。
英文摘要：
We present a near-infrared imaging polarimetric study of the pre-planetary nebula: Frosty Leo. The observations were carried out in J, H and K' bands using the new polarimeter POLICAN mounted on the 2.1m telescope of the Guillermo Haro Astrophysical Observatory, Sonora, Mexico. The most prominent result observed in the polarization maps is a large and well defined dusty envelope (35\arcsec\ diameter in H-band). The polarization position angles in the envelope are particularly well ordered and nearly parallel to the equator of the nebula (seen in J and H bands). The nebula presents a known bipolar outflow and the envelope completely wraps around it. Within the bipolar lobes, we find high polarization levels ranging from $60\%$ (J band) to $90\%$ (K' band) and the polarization angles trace a centrosymmetric pattern. We found the remnants of superwind shells at the edges of the bipolar lobes and the duration of this phase is around 600 yrs. The origin of polarization features in the nebula is most likely due to a combination of single and multiple scattering. Our results clearly demonstrate new structures that provide new hints on the evolution of Frosty Leo from its previous asymptotic giant branch phase.
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