SH2-308：海豚头星云
(原标题: SH2-308: The Dolphin Head Nebula)
2024-06-07
浏览次数: 22
这个宇宙泡泡是由一颗炙热的大质量恒星吹来的疾风吹来的。它的编号为Sharpless 2-308，距离我们大约5000光年，朝向训练有素的大犬星座，它所覆盖的天空比满月略大。这相当于它估计距离的直径为60光年。产生气泡的大质量恒星是一颗沃尔夫-拉叶星，它是星云中心附近的一颗明亮的恒星。沃尔夫-拉叶星的质量是太阳的20多倍，被认为处于大质量恒星演化的短暂前超新星阶段。从这颗沃尔夫-拉叶星吹来的快速气流扫过早期演化阶段中移动较慢的物质，形成了这个泡状星云。这个被风吹起的星云大约有7万年的历史。由窄带滤光片捕捉到的相对微弱的辐射主要是电离氧原子发出的蓝光。SH2-308呈现出一个几乎无害的轮廓，也被称为海豚头星云。
查看原文解释
Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,000 light-years away toward the well-trained constellation Canis Major and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured by narrowband filters in the deep image is dominated by the glow of ionized oxygen atoms mapped to a blue hue. Presenting a mostly harmless outline, SH2-308 is also known as The Dolphin-head Nebula.
© Prabhu Kutti