NGC 7293：螺旋星云
(原标题: NGC 7293: The Helix Nebula)
2021-10-14
浏览次数: 32
在距地球仅700光年的水瓶座方向，一颗类似太阳的恒星正在死亡。它的最后几千年产生了螺旋星云（NGC 7293），这是一个被充分研究的行星状星云的例子，是恒星演化最后阶段的典型代表。总共90个小时的曝光时间创造了这个星云的广阔视野。结合来自红色氢原子发射线和蓝绿色氧原子发射线的窄带图像数据，它显示了螺旋内部明亮区域的显著细节，直径约为3光年。螺旋中心的白点是行星状星云中心的炽热恒星。第一眼看上去很简单的星云，螺旋星云现在被理解为具有令人惊讶的复杂几何结构。
查看原文解释
A mere seven hundred light years from Earth, toward the constellation Aquarius, a sun-like star is dying. Its last few thousand years have produced the Helix Nebula (NGC 7293), a well studied and nearby example of a Planetary Nebula, typical of this final phase of stellar evolution. A total of 90 hours of exposure time have gone in to creating this expansive view of the nebula. Combining narrow band image data from emission lines of hydrogen atoms in red and oxygen atoms in blue-green hues, it shows remarkable details of the Helix's brighter inner region about 3 light-years across. The white dot at the Helix's center is this Planetary Nebula's hot, central star. A simple looking nebula at first glance, the Helix is now understood to have a surprisingly complex geometry.
© Ignacio Diaz Bobillo