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3-D modelling of the collimated bipolar outflows of compact planetary nebulae with WR-type central stars

机译:紧凑行星准直双极流出的三维建模   具有WR型中心恒星的星云

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摘要

We present high-resolution, long-slit spectroscopic observations of fivecompact ($\leq$ 10 arcsec) planetary nebulae located close to the galacticbulge region and for which no high spatial resolution images are available. Thedata have been drawn from the San Pedro M\'artir kinematic catalogue ofgalactic planetary nebulae (L\'opez et al. 2012). The central star in four ofthese objects (M 1-32, M 2-20, M 2-31 and M 3-15) is of WR-type and the fifthobject (M 2-42) has a wels type nucleus. These observations reveal the presencein all of them of a dense and thick equatorial torus-like component andhigh-speed, collimated, bipolar outflows. The code SHAPE is used to investigatethe main morpho-kinematic characteristics and reproduce the 3-D structure ofthese objects assuming a cylindrical velocity field for the bipolar outflowsand a homologous expansion law for the torus/ring component. The deprojectedexpansion velocities of the bipolar outflows are found to be in the range of 65to 200 km $\rm{s^{-1}}$, whereas the torus/ring component shows much slowerexpansion velocities, in the range of 15 to 25 km $\rm{s^{-1}}$. It is foundthat these planetary nebulae have very similar structural components and thedifferences in their emission line spectra derive mostly from their differentprojections on the sky. The relation of their morpho-kinematic characteristicswith the WR-type nuclei deserves further investigation.
机译:我们提供了高分辨率,长缝光谱学观测的五个紧凑型($ leq $ 10 arcsec)行星状星云,位于星系凸起区域附近,并且没有高分辨率的空间分辨率图像。数据来自银河系行星星云的San Pedro M'artir运动学目录(L \'opez等人,2012)。这些物体中的四个(M 1-32,M 2-20,M 2-31和M 3-15)的中心星为WR型,而第五个物体(M 2-42)具有wels型核。这些观察结果揭示了它们所有人中都存在着稠密的赤道圆环状成分以及高速,准直的双极流出。代码SHAPE用于研究主要的形态运动特征,并假设双极流出的圆柱速度场和圆环/环形分量的同源膨胀定律,来再现这些物体的3-D结构。发现双极流出的解投影扩展速度在65至200 km $ \ rm {s ^ {-1}} $的范围内,而圆环/环分量显示的扩展速度要慢得多,在15至25 km的范围内$ \ rm {s ^ {-1}} $。发现这些行星状星云具有非常相似的结构成分,并且它们的发射谱线的差异主要来自它们在天空上的不同投影。它们的形态运动学特征与WR型核的关系值得进一步研究。

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    Akras, S.; López, J. A.;

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  • 年度 2012
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