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眨眼星云

NGC 6826
哈伯太空望远镜 (HST) 拍摄的NGC 6826。
创建者: HST/NASA/ESA.
观测数据
历元 J2000
赤经19h 44m 48.2s[1]
赤纬+50° 31′ 30.3″[1]
距离地球~2000 ly
视星等 (V)8.8[2]
视直径 (V)27″ × 24″[2]
所属星座天鹅座
物理属性
半径 (光年)0.22 x 0.20 ly[2]
其他名称HD 186924, SAO 31951,[1] Caldwell 15
参看:行星状星云星云列表

NGC 6826,也称为Caldwell 15,是位于天鹅座的一个行星状星云。它的俗称是"闪烁行星",但是许多其它的星云也会表现出像这样的"闪烁"。当使用小望远镜直接观看时,受到环绕的星云遮蔽,中央恒星的亮度会被抵消掉。但是,利用外围的视力 (侧视法),会使观测者感觉看到它一亮一暗"闪烁"的现象。

这个星云的一大特色是在两侧都有明亮的瓣,这被称为快速低电离辐射区 (FLIERs,Fast Low-Ionization Emission Regions)。它们似乎相对都很年轻,并以超音速向外移动。依据Bruce Balick (华盛顿大学) 的说法: "从它们被观察到的特性,认为它们像是恒星在晚近的过去 (数千年以前) 向外扔出的火花。但是它们的形状 ... 似乎表明他们是固定的,恒星抛出的物质只是流经过的材料,是从表面刮过去的气体。哈伯未来的观测会监视着FLIERs,以解析出这儿的任何改变。无论何种状况,FLIERs的资料将很容易说明任何恒星演化的模型。"[3]

相关条目

参考资料

  1. ^ 1.0 1.1 1.2 SIMBAD Astronomical Database. Results for NGC 6826. [2007-04-17]. (原始内容存档于2013-06-24). 
  2. ^ 2.0 2.1 2.2 Stellar Scenes Image Collection. NGC 6826. [2007-10-05]. (原始内容存档于2016-03-03). 
  3. ^ astroimages.org. NGC 6826 : The Blinking Nebula. [2007-10-05]. (原始内容存档于2017-07-08). 

外部链接

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眨眼星云
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