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2つの青い茶色矮星が,日食する二重星系で発見されました
Keivan G Stassun1, Robert D Mathieu, Jeff A Valenti
1Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA. keivan.stassun@vanderbilt.edu
Nature
|March 17, 2006
まとめ
私たちは,茶色矮星二重星系を発見し,これらの直接的な測定を提供しました.
科学分野:
- 天文学と天体物理学について
- 恒星と惑星の形成
背景:
- 茶色矮星は,星と惑星の間のギャップを埋めています.
- 茶色矮星の基本的性質は,あまり制限されていない.
- 茶色矮星の形成を理解することは,星と惑星の形成の鍵です.
研究 の 目的:
- 新しく形成された茶色矮星の質量と半径を直接測定するために.
- ブラウン・ナワーの性質を,日食する二重星系で調査する.
- 茶色矮星進化の理論モデルをテストする.
主な方法:
- オリオン星雲のバイナリ系を覆う茶色矮星を発見.
- 質量と半径の直接測定は,日食バイナリ系を用いて行われます.
- 観測された性質と理論的な予測を比較する.
主要な成果:
- 測定された質量:0.054 ± 0.005 M(o) と 0.034 ± 0.003 M(o).
- 測定された半径: 0.669 ± 0.034 R ((o)) と 0.511 ± 0.026 R ((o)).
- 質量が少ない茶色矮星がより熱いことを観測し,モデルに矛盾しています.
結論:
- 直接的な測定は,茶色矮星の地位を確認し,恒星のような大きさを明らかにします.
- この結果は,同時代の茶色矮星進化の現在の理論モデルに異議を唱えている.
- 星下天体形成の理論を精錬するための重要なデータを提供しています.
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