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巨大な恒星 θ 1 Orionis Cからの風によるオリオン分子核1の破壊
C Pabst1, R Higgins2, J R Goicoechea3
1Leiden Observatory, Leiden University, Leiden, The Netherlands.
Nature
|January 9, 2019
まとめ
巨大な恒星は周りの環境に大きな影響を与えるのです 観測により,オリオン星Cの恒星風は,これまで考えられていたよりも大きなバブルを作り,オリオン星の分子核を混乱させています.
科学分野:
- 天体物理学
- 星間媒体のダイナミクス
- 星の形成
背景:
- 巨大な恒星は,恒星間介質にエネルギー (機械的および放射性) を放出する.
- このエネルギーは ガス相に影響し 介質を熱し 恒星の誕生地である 分子雲を乱します
- 恒星風,超新星,UV光子は 分子雲の寿命を左右する 重要な要因です
研究 の 目的:
- 恒星間介質に対する恒星風と放射線の影響を観測的に評価する.
- 速度解析画像を用いて 巨大な恒星のエネルギーと動態を調査する.
- 巨大な星の活動による 分子雲の破壊を定量化するために
主な方法:
- イオン化された炭素 ([C II]) の細部構造線で速度解像度の大きい画像を使用した.
- 1.9 THz (158 μm) の [C II] 線を用いて,オリオン分子核1の1平方度の領域を観測した.
- 細部を研究するために 16 弧秒 (0.03 パーセック) の解像度を達成した.
主要な成果:
- およそ4パーセクの直径のバブルが 発見されました
- 2千6百の太陽質量で 膨張速度が13km/sで バブルの中に
- 恒星風の力学的エネルギーを 殻の運動エネルギーに効率的に変換することを実証した.
結論:
- シェルの膨張と運動エネルギーに 非常に効率的です
- オリオン星1号Cからの恒星風は,光イオン化や超新星よりも,オリオン星1号の分子核1に大きな破壊をもたらします.
- この研究は,局所的な恒星間環境の形成における恒星風の支配的な役割を強調しています.
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