SH 2 - 308 : 海豚頭星雲
SH2-308: The Dolphin Head Nebula
來源：Prabhu Kutti｜發表日期：2024-06-07
這個宇宙氣泡是由一顆炙熱、巨大的恆星產生的急風吹出來的，非常巨大。它被命名為夏普勒斯 2 - 308 ，位於約 5000 光年外的大犬座方向，覆蓋天空的面積比滿月還要大一些。在它的估計距離上，直徑相當於 60 光年。產生氣泡的大質量恆星是一顆沃爾夫-雷葉星，它是星雲中心附近的一顆明亮恆星。天狼射線星的質量是太陽的 20 多倍，被認為處於大質量恆星演化的短暫的超新星前階段。來自這顆天狼射線恆星的快速風，在捲起演化早期階段運動較慢的物質時，形成了氣泡狀星雲。風吹星雲的年齡約為 7 萬年。在深層影像中，窄帶濾光片捕捉到的相對微弱的輻射主要是電離氧原子的光輝，對映成藍色色調。SH 2 - 308 的輪廓基本無害，因此也被稱為海豚頭星雲。
原文：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.
※ 本文由萌芽機器人自動轉貼自每日一天文圖（Astronomy Picture of the Day，APOD），原文為英文，正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理，內容僅供參考，若有任何錯誤之處還請見諒！
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