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arXiv 1608.01258astro-ph.SR
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用OSIRIS/GTC观测行星状星云RWT 152

Observations of the planetary nebula RWT 152 with OSIRIS/GTC

A. Aller, L. F. Miranda, L. Olguín, E. Solano, A. Ulla

摘要:

RWT 152是少数几个已知的行星状星云之一,其中心恒星是sdO。我们提出了亚角秒红色可调谐滤波器Halpha成像和中等分辨率,长缝光谱的RWT 152获得与OSIRIS/GTC的目的是分析其属性。这张Halalpha图像显示了一个双极星云,有一个明亮的赤道区域和主叶中的多个气泡。一个微弱的圆形光晕围绕着主星云。星云光谱显示出一个非常低激发态的星云,有来自H^+、He^+和双电离金属的微弱发射线,除了极微弱的[NII]6584发射线外,没有来自中性和单电离金属的发射线。如果RWT 152是一个密度受限的行星状星云,那么这些光谱就可以得到解释。在RWT 152中获得了低的S、O、Ar、N和Ne的星云化学丰度,这与导出的高特有速度($\sim$ 92-131 km s $^{-1}$)一起表明该天体是一个晕行星状星云。现有数据与RWT 152一致,RWT 152是从在贫金属环境中形成的低质量前体($\sim$ 1 M $_{\odot}$)演变而来的。

英文摘要:

RWT 152 is one of the few known planetary nebulae with an sdO central star. We present subarcsecond red tunable filter Halpha imaging and intermediate-resolution, long-slit spectroscopy of RWT 152 obtained with OSIRIS/GTC with the goal of analyzing its properties. The Halpha image reveals a bipolar nebula with a bright equatorial region and multiple bubbles in the main lobes. A faint circular halo surrounds the main nebula. The nebular spectra reveal a very low-excitation nebula with weak emission lines from H^+, He^+, and double-ionized metals, and absence of emission lines from neutral and single-ionized metals, except for an extremely faint [NII]6584 emission line. These spectra may be explained if RWT 152 is a density-bounded planetary nebula. Low nebular chemical abundances of S, O, Ar, N, and Ne are obtained in RWT 152, which, together with the derived high peculiar velocity ($\sim$ 92-131 km s$^{-1}$), indicate that this object is a halo planetary nebula. The available data are consistent with RWT 152 evolving from a low-mass progenitor ($\sim$ 1 M$_{\odot}$) formed in a metal-poor environment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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