若い恒星からの物質の球形エピソード的な放出
J M Torrelles1, N A Patel, J F Gómez
1Institut d'Estudis Espacials de Catalunya (IEEC/CSIC) and Instituto de Ciencias del Espacio (CSIC), Gran Capità 2, 08034 Barcelona, Spain.
Nature
|May 18, 2001
まとめ
若い恒星は驚くべき球状の爆発で物質を放出し,恒星と惑星の形成に関する現在の理論に挑戦します. これらの発見は,恒星の進化の初期段階に関する新しい洞察を提供します.
科学分野:
- 天体物理学 天体物理学
- 恒星の進化について
- 惑星形成 惑星の形成
背景:
- 恒星形成には,星間物質の凝縮が伴う.
- 理論的モデルでは,恒星の進化過程で角運動量を管理するためにガス噴出を提案しています.
- 以前の観測では,双極性,コリマートエジェクションが理論的な予測と一致していることが示されました.
研究 の 目的:
- 若い恒星形成の過程を調査する.
- 恒星の進化における物質放出の役割を理解する.
- 若い巨大な恒星からの質量放出の性質を調べる.
主な方法:
- 水蒸気マザーの高角解像度観測. 水蒸気マザーの高角解像度観測.
- セフェウスの若い恒星近くのマザー放射の自己運動の分析.
- マザー構造を幾何学モデルに合わせ,射出特性を推測する.
主要な成果:
- 水蒸気マザーの弧は,若くて巨大な恒星の近くで見られました.
- マザー・アークは円に正確にフィットし,球形の源からの膨張を示しています.
- 観測結果から,ちょうど33年前に完全に球状の噴射が発生したと推測される.
結論:
- 観測された球形の対称性とエピソード的性質は,現在の恒星の進化論と矛盾しています.
- この発見は,若い恒星における角運動量除去と質量増加を説明するモデルの見直しを必要としている.
- この研究は,恒星と惑星の形成に関する私たちの理解に影響を与える新しい観測証拠を提供します.
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