伽玛卡斯的幽灵
(原标题: The Ghosts of Gamma Cas)
2023-10-28
浏览次数: 18
仙后座伽玛星在北方秋天傍晚的天空中闪耀。它是仙后座望远镜视野中最亮的尖状恒星。伽马卡斯与幽灵般的星际气体云和尘埃云，IC 59（左上）和IC 63共享着空灵的景象。大约600光年远，这些云实际上并不是鬼。然而，在炽热而明亮的伽马Cas高能辐射的影响下，它们正在慢慢消失。伽马Cas的物理位置距离星云只有3到4光年。IC 63稍微接近伽马Cas，主要是由被恒星紫外线辐射电离的氢原子与电子重新结合而发出的红色h - α光。距离恒星较远的IC 59显示出相对较少的h - α辐射，但更多的是尘埃反射恒星光的蓝色特征。在伽马星及其友星的估计距离上，宇宙阶段的跨度超过1度或10光年。
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Gamma Cassiopeiae shines high in northern autumn evening skies. It's the brightest spiky star in this telescopic field of view toward the constellation Cassiopeia. Gamma Cas shares the ethereal-looking scene with ghostly interstellar clouds of gas and dust, IC 59 (top left) and IC 63. About 600 light-years distant, the clouds aren't actually ghosts. They are slowly disappearing though, eroding under the influence of energetic radiation from hot and luminous gamma Cas. Gamma Cas is physically located only 3 to 4 light-years from the nebulae. Slightly closer to gamma Cas, IC 63 is dominated by red H-alpha light emitted as hydrogen atoms ionized by the star's ultraviolet radiation recombine with electrons. Farther from the star, IC 59 shows proportionally less H-alpha emission but more of the characteristic blue tint of dust reflected star light. The cosmic stage spans over 1 degree or 10 light-years at the estimated distance of gamma Cas and friends.
© Guillaume Gruntz