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蛋星云

蛋星云
哈伯太空望远镜于2002年拍摄的蛋星云
观测资料(历元 J2000)
赤经21h 02m 18.75s[1]
赤纬+36° 41′ 37.8″[1]
距离3,000光年 (920秒差距)
视星等 (V)14.0[1]
视尺度(V)30″ × 15″
星座天鹅座
物理特性
半径0.2 ly[a]
绝对星等 (V)4.2[b]
显著的特征-
其他名称RAFGL 2688,[1] The Egg,[1]
Cygnus Egg[1]
参阅 : 原行星云, 行星状星云列表

蛋星云,the Egg Nebula,也称为RAFGL 2688CRL 2688, 是一个双极原行星云,距离地球大约3,000光年远。这个星云是NASA位于加州巴塞迪纳喷射推进实验室发现的,而在1996年1月16日以RAFGL 2688 的名称发布新闻稿

蛋星云的特征是以一系列明亮的弧和圈子围绕着中心的恒星,浓密的气体和尘埃层层的包裹着中心恒星,阻挡了直接朝向我们的星光。但是,来自中心恒星的光辉还是穿透了灰尘较稀薄的地区,照亮外面数层的气体,创造出被看见的弧光和灿烂的图像。

围绕着中心恒星的多灰尘的包层非常可能是圆盘状的。在影像中的双极流出物显示系统有角动量,这与吸积盘的孳生非常相似。另一方面,圆盘的几何形状允许光沿着圆盘的轴心逃脱,说明了外面数层包层厚度的变化,但依然阻止了我们直接沿着圆盘边缘观测的意图。虽然,已经在一些位于渐近巨星分支的天体星周围证实有多灰尘的圆盘(S. De Ruyter et. al, 2006),仍需要证实有圆盘环绕着蛋星云。

蛋星云的照片是哈伯太空望远镜第二代广域和行星照相机拍摄的。

注解

[编辑]
  1. ^ distance × sin ( diameter_angle / 2 ) = 0.2 ly. radius
  2. ^ 14.0[1] apparent magnitude - 5 * (log10(920 pc distance) - 1) = 4.2 absolute magnitude

参考资料

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 SIMBAD Astronomical Database. Results for Egg Nebula. [2007-01-05]. (原始内容存档于2020-06-15). 
  1. Hubble Finds Searchlight Beams and Multiple Arcs around a Dying Star页面存档备份,存于互联网档案馆). STScI Press release: Space Telescope Science Institute. January 16, 1996.
  2. De Ruyter et al. Keplerian discs around post-AGB objects: a common phenomenon? Astronomy & Astrophysics 448, 641–653 (2006).
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蛋星云
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