arXiv 0712.26392007-12-17astro-ph

基于SHASSA成像数据的10个邻近行星状星云H $α$晕分布

The H$α$ Halo Distribution of 10 Nearby Planetary Nebulae based on the SHASSA Imaging Data

Chih Hao Hsia, Jin Zeng Li, Wing-Huen Ip

备注：: 28 pages, 11 figures, 3 tables, submitted to New Astronomy

摘要：

在这里，我们提出了我们的搜索广泛的光环周围的行星状星云（PNE）在我们的银河系的基础上从南H-阿尔法巡天图集（SHASSA）的成像数据的初步结果。使用H $α$发射中的阈值表面亮度来帮助识别PNe的空间扩展特征。我们调查了一个样本，其中包括10 PNE，其中大部分被发现是由广泛的外晕包围。这些晕的形成可能与AGB相质量损失和/或恒星外流与星际介质的相互作用密切相关。这些外晕大部分都是近似球形的。对He 2-111和NGC 3242等特定天体的详细研究表明，它们的运动学年龄约为10 $^{5}$ yr，质量损失历史可追溯到其前身星演化的AGB晚期。来自样本的两个物体（He 2-111，NGC 3242）被发现有带有碎片弧的外晕，这显然是它们与星际介质相互作用的结果。

英文摘要：

Here we present initial results of our search for extensive halos around the planetary nebulae (PNe) in our Galaxy based on imaging data from the Southern H-Alpha Sky Survey Atlas (SHASSA). A threshold surface brightness in H$α$ emission was used to help identify the spatially extended features of the PNe. We investigated a sample that included 10 PNe, the large majority of which were found to be surrounded by extensive outer halos. The formation of these halos might be closely related to the AGB phase mass loss and/or the interaction of the stellar outflows with the interstellar medium. Most of these outer halos are nearly spherical. Close investigation of some specific objects, such as He 2-111 and NGC 3242, indicate a kinematic age on the order of 10$^{5}$ yrs. The mass loss history can be traced back to the late AGB phase of the evolution of the progenitors. Two objects form the sample (He 2-111, NGC 3242), were found to have outer halos with fragmented arcs that are apparently the result of their interaction with the interstellar medium.

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英文摘要：

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