Astronomy Picture of the Day——火焰星云 ​

IC 405: The Flaming Star Nebula 
Credit: Eric Coles and Mel Helm

Explanation: Rippling dust and gas lanes give the Flaming Nebula its name. The orange and purple colors of the nebula are present in different regions and are created by different processes. The bright star AE Aurigae, emitting light so energetic it knocks electrons away from surrounding gas. When a proton recaptures an electron, red light is frequently emitted. The purple region's color is a mix of this red light and blue light emitted by AE Aurigae but reflected to us by surrounding dust. The two regions are referred to as emission nebula and reflection nebula, respectively. Pictured here in the Hubble color palette, the Flaming Nebula, officially known as IC 405, lies about 1500 light years distant, spans about 5 light years, and is visible with a normal telescope toward the constellation of the Charioteer.

IC 405：火焰星云 

火焰星云，这个名字源自其周围涟漪般的尘埃和气条带。这个星云不同区域分别呈现出橙色和紫色，不同的颜色产生于不同的物理进程。图片左侧的亮星是御夫座AE，它的温度极高，所以显示为蓝色，它发出的高能光线能使周围气体内的电子脱离出来。而当电子被质子重新俘获时，就会发出红色波段的光 (图中显示为橙色)。紫色区域是由这种红光和御夫座AE所发出的被周围尘埃反射的蓝光混合而成。这两种区域分别被称作发射星云和反射星云 。火焰星云的正式命名为IC 405, 它距离地球约1500光年, 跨度约5光年，使用普通望远镜可以在御夫座方向看到它。

高清原图地址：

https://apod.nasa.gov/apod/image/2001/IC405hp_ColesHelm_3447.jpg

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