Sh2-308：海豚形星泡
(原标题: Sh2-308: A Dolphin Shaped Star Bubble)
2023-03-29
浏览次数: 15
哪颗恒星产生了这个气泡？它不是气泡右边那颗明亮的星星。它也不是一只巨大的太空海豚。它是蓝色星云中心的一颗恒星，一颗著名的能量充沛的沃尔夫-拉叶星。一般来说，沃尔夫-拉叶星的质量是太阳的20多倍，它们排出的快速粒子风可以形成标志性的星云。在这种情况下，由此产生的恒星气泡跨度超过60光年，大约有7万年的历史，碰巧看起来像海豚的头。这个名为Sh2-308的气体球被称为海豚头星云，距离我们约5000光年，覆盖的天空和满月一样多——尽管它要暗得多。在这张特色图片的左边，附近的红色云的发光和形状可能是由于同一颗沃尔夫-拉叶星发出的高能光。
查看原文解释
Which star created this bubble? It wasn't the bright star on the bubble's right. And it also wasn't a giant space dolphin. It was the star in the blue nebula's center, a famously energetic Wolf-Rayet star. Wolf-Rayet stars in general have over 20 times the mass of our Sun and expel fast particle winds that can create iconic looking nebulas. In this case, the resulting star bubble spans over 60 light years, is about 70,000 years old, and happens to look like the head of a dolphin. Named Sh2-308 and dubbed the Dolphin-Head Nebula, the gas ball lies about 5,000 light years away and covers as much sky as the full moon -- although it is much dimmer. The nearby red-tinged clouds on the left of the featured image may owe their glow and shape to energetic light emitted from the same Wolf-Rayet star.
© Aleix Roig (AstroCatInfo)