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Glossary term: 恆星形成

Description: 恆星的誕生源於巨型分子雲中被稱為核心的低溫緻密區域的引力坍縮,這些區域大多位於星系的旋臂中。恆星的形成涉及復雜的物理過程,發生在不同的尺度上,由引力、壓力、輻射、磁場、湍流、化學等作用造成,其中有些作用至今仍不甚明瞭。根據母雲的質量和形成階段的吸積過程,恆星的質量從 0.08 到幾百個太陽質量不等。大多數恆星都不是孤立形成的,而是恆星群的一部分。在形成階段,中心恆星週圍會形成一個原恆星盤,最終為行星的形成提供原材料。

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Related Media


一團烏雲遮住了背景恆星。前方,兩股物質噴流從中心物體向相反方向噴射

見證一顆恆星的誕生

Caption: 阿塔卡馬大毫米波/亞毫米波陣列(ALMA)和歐洲南方天文臺新技術望遠鏡(NTT)拍攝的射電和可見光組合圖像,揭示了赫比格-哈羅天體 HH 46/47 中一顆恆星的誕生過程。橙色和綠色的 ALMA 數據揭示了來自中央原恆星的高能噴流,由於塵埃遮擋和高密度氣體的存在,該噴流在可見光波段被掩蓋。粉色和紫色的 NTT 數據突出顯示了噴流向觀測者發射的可見光。
Credit: ESO/ALMA (ESO/NAOJ/NRAO)/H.Arce. 致謝:Bo Reipurth credit link

License: CC-BY-3.0 Creative Commons Attribution 3.0 Unported icons


年輕恆星沿著氣體帶形成

恆星誕生環境

Caption: 使用阿塔卡馬大型毫米/亞毫米波陣(ALMA)和甚大陣(VLA),拍攝了獵戶座分子雲中多顆原恆星形成的快照,更仔細地觀察了每顆原恆星。對於恆星形成的過程和早期階段,以及恆星從中形成的母雲所產生的影響,這樣的圖像提供了獨特的見解。
Credit: ALMA (ESO/NAOJ/NRAO), J. Tobin; NRAO/AUI/NSF, S. Dagnello; Herschel/ESA credit link

License: CC-BY-3.0 Creative Commons Attribution 3.0 Unported icons