风吹的ngc3199
(原标题: Windblown NGC 3199)
2021-05-06
浏览次数: 32
NGC 3199位于大约12000光年之外，是位于船底座南部的一片发光的宇宙云。在这张窄带伪色图中，星云的直径约为75光年。虽然深层图像显示了一个或多或少完整的气泡形状，但它看起来非常不平衡，顶部的边缘要亮得多。靠近中心的是一颗沃尔夫-拉叶星，这是一颗大质量、高温、寿命短的恒星，它会产生强烈的恒星风。事实上，众所周知，沃尔夫-拉叶星在强大的风扫过周围的星际物质时，会产生形状有趣的星云。在这种情况下，明亮的边缘被认为是恒星穿过均匀介质时产生的弓形激波，就像船穿过水一样。但是测量表明，这颗恒星并没有直接向明亮的边缘移动。所以一个更有可能的解释是，恒星周围的物质不是均匀的，而是聚集在NGC 3199明亮的边缘附近，密度更大。
查看原文解释
NGC 3199 lies about 12,000 light-years away, a glowing cosmic cloud in the nautical southern constellation of Carina. The nebula is about 75 light-years across in this narrowband, false-color view. Though the deep image reveals a more or less complete bubble shape, it does look very lopsided with a much brighter edge along the top. Near the center is a Wolf-Rayet star, a massive, hot, short-lived star that generates an intense stellar wind. In fact, Wolf-Rayet stars are known to create nebulae with interesting shapes as their powerful winds sweep up surrounding interstellar material. In this case, the bright edge was thought to indicate a bow shock produced as the star plowed through a uniform medium, like a boat through water. But measurements have shown the star is not really moving directly toward the bright edge. So a more likely explanation is that the material surrounding the star is not uniform, but clumped and denser near the bright edge of windblown NGC 3199.
© Mike Selby