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広い距離で四重星系が形成される
Jaime E Pineda1, Stella S R Offner2, Richard J Parker3
1Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland.
Nature
|February 13, 2015
まとめ
フィラメントの断片化は,広範囲に分離された四重星系を作り出すことができます. 観測により,星を形成する密度の高いガス凝縮が明らかになり,これは複数の星系起源の実行可能な経路であることを示唆しています.
科学分野:
- 天文学 天文学
- 天体物理学 天体物理学
- 星の形成 星の形成 星の形成
背景:
- 恒星系における最初の星の数 (多重性) は不確実である.
- 複数の星系形成の提案されたメカニズムには,核の断片化,円盤の断片化,恒星捕獲が含まれます.
- 若い恒星におけるより高い多様性は,初期のダイナミックな相互作用がシステムを修正することを示唆しています.
研究 の 目的:
- 恒星系の初期多様性を調査する.
- 支配的なバイナリ形成機構を決定する.
- 形成中の複数の恒星系を直接観測する.
主な方法:
- 広い距離の四重体系の高解像度観測.
- 3つの重力的に結合した密集したガス凝縮体を持つ若い原星の分析.
- システムの断片化と安定性の評価.
主要な成果:
- 若い原星と3つの結合されたガスの凝縮を伴う四重系を観測した.
- フィラメントの断片化によって形成された凝縮物で,それぞれが4万年後に星を形成すると予想されています.
- システムは束縛されているが,50万年というスケールで不安定である.
結論:
- 大きなスケールでフィラメントの断片化 (約. 5,000 AU) は,複数のシステム形成のための実行可能な経路です.
- 初期のダイナミックな相互作用は,おそらく恒星系の多様性を形成する役割を果たしている.
- 形成系を直接観察することは,バイナリ形成機構を理解するために極めて重要です.
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