Astronomy Picture of the Day——IC 405：火焰恒星星云

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

Explanation: Rippling dust and gas lanes give the Flaming Star Nebula its name. The orange and purple colors of the nebula are present in different regions，and created by different processes. The bright star AE Aurigae, visible to the image left, is so hot. it is blue, 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 Star Nebula, officially known as IC 405, lies about 1500 light years distant, spans about 5 light years, and is visible with a formal telescope toward the constellation of the Charioteer .

IC 405：火焰恒星星云 

火焰恒星星云这个名字来自其周围涟漪般的尘埃和气体条带。火焰恒星星云不同区域分别呈现出的橙色和紫色产生于不同的物理过程。左侧的亮星是御夫座AE，因温度极高，所以显现为蓝色光芒，它所发出光线具有很高的能量，激发出周围气体内的电子。当电子重新被质俘获时，便会发出橙光。紫色是由这种红光和被周围的尘埃反射的蓝光混合而成。这两个区域分别被称作发射星云和反射星云 。哈勃太空望远镜拍摄的这幅照片中的星云，正式命名为IC 405，距离地球约1500光年，使用普通望远镜便可在御夫座中观测到。

高清原图地址：

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

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