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arXiv 1102.1309astro-ph.GA
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邻近行星状星云的轨道及其与星际介质的相互作用

Orbits of nearby planetary nebulae and their interaction with the interstellar medium

Zhen-Yu Wu, Jun Ma, Xu Zhou, Cui-Hua Du

摘要:

我们提出并分析了八个附近的行星状星云(PNs)使用两种不同的银河系模型的轨道。用蒙特卡罗方法确定了轨道参数的误差。根据计算的轨道参数,我们发现Sh 2-216、DeHt 5、NGC 7293、A21和Ton 320属于薄盘星群,PG 1034+001和A31属于厚盘星群。PuWe 1可能属于厚盘星族,但由于其轨道参数的较大误差,其星族分类非常不确定。在我们的样本中,观察到八个PN的PN-ISM相互作用。PNs自行的位置角与PN-ISM相互作用区的方向一致。PNs的运动学年龄远小于它们穿过银道面的时间。使用Borkowski等人和Soker等人的模型,PN-ISM相互作用可用于导出演进PN附近的ISM的局部密度。根据Wareing等人(WZO)的三维水动力学模拟,Sh 2-216、A21和Ton 320处于WZO 3阶段,PG 1034+001和NGC 7293处于WZO 1阶段,PuWe 1处于WZO 2阶段。

英文摘要:

We present and analyze the orbits of eight nearby planetary nebulae (PNs) using two different Galactic models. The errors of the derived orbital parameters are determined with a Monte Carlo method. Based on the derived orbital parameters, we find that Sh 2-216, DeHt 5, NGC 7293, A21, and Ton 320 belong to the thin-disk population, and PG 1034+001 and A31 belong to the thick-disk population. PuWe 1 probably belongs to the thick-disk population, but its population classification is very uncertain due to the large errors of its derived orbital parameters. The PN-ISM interactions are observed for the eight PNs in our sample. The position angles of the proper motions of the PNs are consistent with the directions of the PN-ISM interaction regions. The kinematic ages of PNs are much smaller than the time for them to cross the Galactic plane. Using the models of Borkowski et al. and Soker et al., the PN-ISM interaction can be used to derive the local density of ISM in the vicinity of evolved PNs. According to the three-dimensional hydrodynamic simulations of Wareing et al. (WZO), Sh 2-216, A21, and Ton 320 are in the WZO 3 stage, PG 1034+001 and NGC 7293 are in the WZO 1 stage, and PuWe 1 is in the WZO 2 stage.

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