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三重系の動的展開による最も広い二重星の形成
1Institute for Astronomy, University of Hawaii at Manoa, 640 North Aohoku Place, Hawaii 96720, USA. reipurth@ifa.hawaii.edu
Nature
|December 11, 2012
まとめ
超広の二重星は,恒星形成理論に挑戦し,コンパクトな三重システムから形成することができます. 数百万年にわたるダイナミックな分散は,一つの恒星を放出し,二重星を模倣する広い分離を生み出します.
科学分野:
- 天文学と天体物理学について
- 恒星力学 恒星力学とは
- スター・フォーメーション
背景:
- 非常に広い二重星系は,典型的な雲の核サイズを超える分離により,現在の星形成理論に挑戦しています.
- ウルトラワイドバイナリーの既存の仮説には,星群の解消と重力捕獲が含まれています.
- 最近の観測は,非常に広い二重星を三重システムと結びつけ,近い二重星にはしばしば遠くの第三の伴侶があります.
研究 の 目的:
- 誕生する雲のコア内の新生トリプルシステムの動的進化を調査する.
- 天文調査で観測された非常に広い二重星系の形成を説明するために.
- 恒星形成の理論モデルと,広い二重星系と三重星系に関する観測データとの調和を図る.
主な方法:
- N-bodyシミュレーションは,若い三重星系の動的進化をモデル化するために使用されました.
- シミュレーションは,クラウド・コア内の初期コンパクト状態からシステムを追跡した.
- 進化は,長期のダイナミックな効果を観察するために,何百万年という時間尺度で分析されました.
主要な成果:
- シミュレーションでは,コンパクトなトリプルシステムは,極端な階層的なアーキテクチャに進化することが示されています.
- ダイナミックな分散は,一つの構成星を非常に遠い軌道に放出することができます.
- 射出のためのエネルギーは,他の2つの星の回路の縮小から来るので,それらは1つの星のように見えます.
結論:
- 緩やかな三重系は,ダイナミックに進化し,非常に広いバイナリーとして現れる可能性があります.
- このメカニズムは,観測された超幅バイナリーシステムの形成について,実行可能な説明を提供します.
- この発見は,恒星系アーキテクチャの形成において,ダイナミックな進化が重要な役割を果たしていることを示唆している.
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