双星行星状星云的核朝向银河系的膨胀。II。倾向于双极性和低电离结构
Binary planetary nebulae nuclei towards the Galactic bulge. II. A penchant for bipolarity and low-ionisation structures
摘要：
相当大的努力已被应用于了解负责行星状星云（PNe）所表现出的各种形态的精确成形机制。一个二进制的同伴越来越多地获得支持，作为一个主导的形成机制，但形态学研究的少数PNE，我们知道肯定是由二进制的演变是稀缺或偏见。OGLE-III光度变化巡天中新发现的中心双星（CSPN）大大增加了可用于形态分析的后共包络（CE）星云样本。我们目前的双子座南窄带图像的新样本，以补充现有的数据在30后CE星云的定性形态研究。近30%的星云具有典型的双极形态，然而，一旦在几何模型的帮助下将倾斜效应纳入其中，这一比例就会上升到60%。这是迄今为止将CE进化与双极形态联系起来的最强有力的观察证据。高于平均比例的样品显示出低电离结、细丝或喷射，暗示着二元起源。这些功能也是常见的发射线核，这可能是解释的投机二元形成的情况下，H-缺乏CSPN。
英文摘要：
Considerable effort has been applied towards understanding the precise shaping mechanisms responsible for the diverse range of morphologies exhibited by planetary nebulae (PNe). A binary companion is increasingly gaining support as a dominant shaping mechanism, however morphological studies of the few PNe that we know for certain were shaped by binary evolution are scarce or biased. Newly discovered binary central stars (CSPN) from the OGLE-III photometric variability survey have significantly increased the sample of post common-envelope (CE) nebulae available for morphological analysis. We present Gemini South narrow-band images for most of the new sample to complement existing data in a qualitative morphological study of 30 post-CE nebulae. Nearly 30% of nebulae have canonical bipolar morphologies, however this rises to 60% once inclination effects are incorporated with the aid of geometric models. This is the strongest observational evidence yet linking CE evolution to bipolar morphologies. A higher than average proportion of the sample shows low-ionisation knots, filaments or jets suggestive of a binary origin. These features are also common around emission-line nuclei which may be explained by speculative binary formation scenarios for H-deficient CSPN.
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