2020年03月02日:夏普利斯308:海豚星云-(Sharpless-308: The Dolphin Nebula)

2020年03月02日:夏普利斯308:海豚星云-(Sharpless-308: The Dolphin Nebula)

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2020-03-02 / 0 评论 / 0 阅读 / 正在检测是否收录...

2020年03月02日:夏普利斯308:海豚星云-(Sharpless-308: The Dolphin Nebula)
2020年03月02日:夏普利斯308:海豚星云-(Sharpless-308: The Dolphin Nebula)--原图下载


Image Credit & Copyright: Chilesope 2, Pleaides Astrophotography Team (Peking U.)
说明: 这团由炽热大质量恒星的高速恒星风,所吹袭出来的巨大宇宙气泡,体积远大于与其同形的海豚。编录号为夏普利斯2-308 (Sharpless 2-308)的这团星云,位在大犬座方向,离我们约有5,200光年远,遮住的天区略大于满月。 依它所在的距离来换算,这团星云的直径大约为60光年。 造成这个泡泡的大质量恒星,是位在星云中心附近的明亮沃夫-瑞叶型恒星。 由于沃夫-瑞叶型恒星的质量是太阳的20倍以上,演化非常快速,它目前可能处在短暂的前超新星阶段。源自这颗沃夫-瑞叶恒星的高速恒星风,推扫在先前演化阶段抛出的较慢速移动物质,形成了这团形如气泡的星云。这团由风吹成的星云,年龄在70,000年左右。 在这幅大视野影像中,以蓝色渐层来呈现主要源自电离氧原子的暗淡辐射。

原文:

Image Credit & Copyright: Chilesope 2, Pleaides Astrophotography Team (Peking U.)
Explanation: Blown by fast winds from a hot, massive star, thiscosmic bubble is much larger than the dolphin it appears to be.Cataloged asSharpless 2-308it lies some 5,200 light-years away toward the constellation ofthe Big Dog(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, aWolf-Rayetstar, is the bright one near the center of the nebula.Wolf-Rayetstars 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-Rayetstar 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 70,000years.Relatively faint emission captured in the featured expansive imageis dominated by the glow of ionized oxygen atomsmapped to a blue hue.

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