The "Principes de Asturias" nebula: A new quadrupolar planetary nebula from the IPHAS survey
The "Principes de Asturias" nebula: A new quadrupolar planetary nebula from the IPHAS survey
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“阿斯图里亚斯王子”星云：来自 IPHAS 巡天的新四极行星状星云
DOI：
10.1051/0004-6361:20054778
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发表时间：
2006
影响因子：
6.5
通讯作者：
A. Zijlstra
中科院分区：
文献类型：
--
作者：
A. Mampaso;R. Corradi;K. Viironen;P. Leisy;R. Greimel;J. Drew;M. Barlow;D. Frew;J. Irwin;R. Morris;Q. Parker;S. Phillipps;E. Rodr'iguez;A. Zijlstra
上下文艾萨克·牛顿望远镜光度H α巡天（IPHAS）目前正在绘制北方银河平面，达到$r '= 20$ mag，分辨率通常为1“。 预计将发现数百个行星状星云（PNe），包括点状和解析的。我们报告发现的第一个新的PN从这次调查：这是一个不寻常的对象位于一个大的银河系中心的距离，并有一个非常低的氧丰度。目标。探测和研究新的PNe将导致改进的人口规模，二进制分数和寿命的估计，并产生新的见解星际介质的化学在大银河系中心的距离。方法.在IPHAS测光表中寻找致密星云，选择那些在r '-{\rm H}\alpha$ vs. r'-i '$色-色图中具有强H α过剩的候选星云。扩展星云的观测是通过对空间采样为5arcsec 2的连续减影H α图像的马赛克进行目视检查来进行的。后续光谱能够确认PNe及其物理化学研究。结果通过IPHAS图像发现的第一个行星状星云显示了复杂的形态：有一个围绕中央星星的内环，明亮的内叶具有增强的腰部，非常微弱的小叶延伸达到100多"。我们将其归类为四极PN，这是一种相当不寻常的行星，显示出两对错位的裂片。从长缝光谱学中我们得到Te [ Nii$] = 12\,800pm 1000 $ K，$N_{\rm e} = 390 pm 40 $ cm-3，以及Peimbert I型星云的典型化学丰度（He/H =0.13$，N/O =1.8$），氧丰度为12 + log（O/H）= 8.17 pm0.15 $.计算得到该星云的运动学距离为7.0 ^{+4.5}-3.0}千秒差距，这意味着该星云具有大于4千秒差距的异常大的尺寸。中心星星的光度测定表明存在一颗相对较冷的伴星。这一点，以及致密的拱星盘和四极形态的证据，所有这些都是罕见的PNe，支持这一假设，这种形态是与二进制的相互作用。
Context. The Isaac Newton Telescope Photometric H α Survey (IPHAS) is currently mapping the Northern Galactic plane reaching to $r'=20$ mag with typically 1″ resolution. Hundreds of Planetary Nebulae (PNe), both point-like and resolved, are expected to be discovered. We report on the discovery of the first new PN from this survey: it is an unusual object located at a large galactocentric distance and has a very low oxygen abundance. Aims. Detecting and studying new PNe will lead to improved estimates of the population size, binary fraction and lifetimes, and yield new insights into the chemistry of the interstellar medium at large galactocentric distances. Methods. Compact nebulae are searched for in the IPHAS photometric catalogue, selecting those candidates with a strong H α excess in the $r'-{\rm H}\alpha$ vs. $r'-i'$ colour–colour diagram. Searches for extended nebulae are by visual inspection of the mosaics of continuum-subtracted H α images at a spatial sampling of $5\times5$ arcsec 2 . Follow-up spectroscopy enables confirmation of the PNe, and their physico-chemical study. Results. The first planetary nebula discovered via IPHAS imagery shows an intricate morphology: there is an inner ring surrounding the central star, bright inner lobes with an enhanced waist, and very faint lobular extensions reaching up to more than 100 '' . We classify it as a quadrupolar PN, a rather unusual class of planetary showing two pairs of misaligned lobes. From long-slit spectroscopy we derive T e [ Nii$] =12\,800\pm1000$ K, $N_{\rm e} = 390\pm40$ cm -3 , and chemical abundances typical of Peimbert's type I nebulae ($\rm {\rm He/H} =0.13$, $\rm {\rm N/O} =1.8$) with an oxygen abundance of $12+\log({\rm {\rm O/H}})=8.17\pm0.15$. A kinematic distance of 7.0$^{+4.5}_{-3.0}$ kpc is derived, implying an unusually large size of >4 pc for the nebula. The photometry of the central star indicates the presence of a relatively cool companion. This, and the evidence for a dense circumstellar disk and quadrupolar morphology, all of which are rare among PNe, support the hypothesis that this morphology is related to binary interaction.