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2012-08-16 眉月星云NGC 6888
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dailyas...@gmail.com
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Aug 16, 2012, 1:01:01 AM
8/16/12
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直经达25光年的NGC 6888又名为眉月星云(Crescent Nebula),它是位在中心处一个大质量亮星恒星风所吹出的泡泡。这张彩色星云照片结合了数个窄波段影像数据,并用哈伯望远镜的色盘来上色;例如:星云内部的硫、氢及氧等原子之辐射,分别以红、绿及蓝等色阶来着色。NGC 6888的中心星(WR 136)是颗沃夫-瑞叶型恒星,它的强烈恒星风让外层气壳发生剥离,每10,000年大约抛出相当于一个太阳的质量。星云复杂的构造很可能是,强烈的恒星风和更早期抛出的物质交互作用之产物。这颗接近生命末期的恒星以惊人的速率燃烧核燃料,并将以壮烈的超新星爆炸终结其一生。位在星云拥挤天鹅座内的NGC 6888,离我们约有5,000光年远。
内容提供:
http://apod.nasa.gov/apod/ap120816.html
中文翻译:成功大学物理学系 苏汉宗,陈昭敏 等
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