御夫座AE星与火焰星星云
影像来源与版权:Amir Abolfath (TWAN)

说明:御夫座AE星着火了吗?没有。虽然御夫座AE星被称为火焰星,其附近的星云IC 405被命名为火焰星星云,而且该区域的外形呈现出火焰状,但是它并没有着火。火焰通常被定义为物质与氧气结合的产物,只有在具有足够氧气时才会发生,因此在如此高能且低氧的环境下(例如恒星),火焰并不存在。这种烟雾状的物质主要是星际空间的氢,但有些是富含碳的黑暗丝状尘埃颗粒。亮星御夫座AE星在影像中心右下方可见,因为它非常炽热,所以发出了蓝色辉光,而它发出的高能星光则将电子从周围气体中撞出。当质子重新获得电子时,恒星就会发光,就像在附近的发射星云中看到的那样。在这幅特征影像中,火焰星星云距离我们约1,500光年,跨度约5光年,我们用一台小型望远镜朝御夫座方向就能看到它。
翻译:北京天文馆

AE Aurigae and the Flaming Star Nebula
Image Credit & Copyright: Amir Abolfath (TWAN)

Explanation: Is star AE Aurigae on fire? No. Even though AE Aurigae is named the flaming star, the surrounding nebula IC 405 is named the Flaming Star Nebula, and the region shape gives the appearance of fire, there is no fire. Fire, typically defined as the rapid molecular acquisition of oxygen, happens only when sufficient oxygen is present and is not important in such high-energy, low-oxygen environments such as stars. The material that appears as smoke is mostly interstellar hydrogen, but does contain smoke-like dark filaments of carbon-rich dust grains. The bright star AE Aurigae, visible just to the lower right of the image center, is so hot it glows blue, emitting light so energetic it knocks electrons away from surrounding gas. When a proton recaptures an electron, light is emitted, as seen in the surrounding emission nebula. Featured here, the Flaming Star nebula lies about 1,500 light years distant, spans about 5 light years, and is visible with a small telescope toward the constellation of the Charioteer (Auriga).
Astronomy Picture of the Day 03/26/2019