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青い恒星物体M17-SO1のシルエットには高質量原星はありません
Shigeyuki Sako1, Takuya Yamashita, Hirokazu Kataza
1Department of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan. sako@ioa.s.u-tokyo.ac.jp
Nature
|April 23, 2005
まとめ
巨大な恒星の形成は不明である. この研究は,主張された巨大な原星の発見を修正し,それが中間質量であることが判明し,高質量星の単一星形成理論に挑戦しています.
科学分野:
- * 天体物理学
- * 恒星の進化について
背景:
- * 超大質量恒星の形成機構は,低質量恒星とは異なり,ほとんど解明されていません.
- * 巨大な恒星が単独で形成されるのか,それとも小さな恒星が星群に合体して形成されるのか,議論されている.
- * 最近の主張では,M17の巨大な原星が低質量恒星のように形成され,興味をそそった.
研究 の 目的:
- * M17恒星形成地域にある,主張されている巨大な原星の質量を再評価する.
- * 巨大な恒星の誕生の文脈で,このプロトスターの形成経路を調査する.
主な方法:
- * M17の原星とその周辺環境の観測分析.
- * 原星,環恒星膜,および局所分子雲の質量推定.
主要な成果:
- *原星の質量は,太陽の質量 (M) 2.5〜8の間の中間質量であると決定されました.
- * これは,初期請求の2000万円と矛盾する.
- * 周囲の封筒の質量は0.09Mであり,地元の雲は4-9Mを含んでいる.
結論:
- * 研究された原星は,低質量恒星のように形成された単一で非常に大きな恒星を表しているわけではありません.
- *この発見は,この天体の形成メカニズムが,高質量恒星形成の典型ではないことを示唆しています.
- * 巨大な恒星の誕生の多様な経路を明らかにするためにさらなる研究が必要である.
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