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比如这些飙车的恒星 总有一些家伙爱出风头 - 站长搜索
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比如这些飙车的恒星 总有一些家伙爱出风头

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2016-02-19 15:40:15 转载来源: 网络整理/侵权必删

太阳围绕银河系中心运行的速度可达每秒220公里,而它与大部分恒星、星云的相对速度基本上是保持一致的。但有一些恒星却能以相对异常的高速在星际空间中穿行,当它们突入气体云中时,其前方会产生一道明显的“弓形激波”

太阳围绕银河系中心运行的速度可达每秒220公里,而它与大部分恒星、星云的相对速度基本上是保持一致的。

但有一些恒星却能以相对异常的高速在星际空间中穿行,当它们突入气体云中时,其前方会产生一道明显的“弓形激波”。

总有一些家伙爱出风头,比如这些飙车的恒星

▲鹿豹座BZ也是一颗“运动”中的恒星。NSF

这样的“弓形激波”,是恒星在相对静止的气体中劈波斩浪向前运动时,聚集在其前方的星际物质,其原理和快艇前方掀起的浪花大致相似。

总有一些家伙爱出风头,比如这些飙车的恒星

▲银心方向的“运动”星IRS-8。双子座天文台

恒星前方的气体被恒星的运动压缩,分子间的碰撞会导致气体温度上升。

▲NASA / JPL-Caltech /怀俄明大学

气体变热后,便开始辐射热量。因此我们可以通过红外波段看到它发出的辉光。假如能量足够大,我们甚至可以在可见光波段上看到它。

▲NASA / JPL-Caltech /怀俄明大学

这些恒星的运动速度之所以比一般恒星高,是因为它们受到了恒星爆发或星团引力作用的影响,被狠狠“踢”了一脚,在某个方向上获得了额外的动能。

▲NASA / JPL-Caltech /怀俄明大学

恒星的质量越大,产生的激波就越壮观,因为它们能够影响到的星际物质总量较大。

总有一些家伙爱出风头,比如这些飙车的恒星

▲“运动”中的巨星――蛇夫座ζ。NASA / JPL-Caltech / UCLA

由于这是一些被加热了的物质,因此人们在红外波段上,能够拍到最佳的激波影像。

▲“运动”中的超巨星――王良二。NASA / JPL-Caltech

目前已知银河系内存在着几百颗这样的恒星,而理论上它们在每个星系中存在的数量可达几千甚至几百万。

总有一些家伙爱出风头,比如这些飙车的恒星

▲哈勃太空望远镜拍到的4颗“运动”恒星。NASA / ESA /哈勃太空望远镜

▲鹿豹座α是一颗“运动”中的超大质量O型恒星,距离地球约6900光年。NASA / JPL-Caltech / WISE

总有一些家伙爱出风头,比如这些飙车的恒星

▲猎户座大星云中的“猎户座LL”,是一颗“运动”中的恒星。NASA /哈勃太空望远镜

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