磁気化されたトーラスを持つ惑星星雲からの水マザー放射
L F Miranda1, Y Gómez, G Anglada
1Instituto de Astrofísica de Andalucía, CSIC, Apdo. Correos 3004, E-18080 Granada, Spain. lfm@iaa.es
Nature
|November 20, 2001
まとめ
天文学者は,惑星の星雲K3-35から水マザー放射を検出し,これらの分子が恒星が進化するにつれて消失するという予想に挑戦しました. この発見は,K3-35が巨大な恒星から惑星星雲への移行中に捕獲されたことを示唆しています.
科学分野:
- 天文学と天体物理学について
- 恒星の進化について
- アストロケミストリー アストロケミストリー
背景:
- 惑星性星雲は,太陽のような星が外殻を放出し,熱い恒星核によってイオン化されると形成されます.
- この移行の間,水のような分子は通常,激しい放射線によって破壊されます.
- ウォーターマザー放射は,惑星性星雲では予想しない,以前の巨大な恒星包装の特徴です.
研究 の 目的:
- 惑星性星雲K3-35.5における水マザー放射の存在を調査する.
- この移行物体における水質マザーの分布と興奮機構を理解するために.
- K3-35がユニークなケースなのか,それとも恒星の進化の共通の段階なのかを判断する.
主な方法:
- ラジオ天文学の技術を使用して,水マザー放射の検出.
- K3-35.5内のマザー放射の空間分布をマッピングする.
- 周りのガス構造の分析,トーリと双極性葉を含む.
主要な成果:
- 惑星の星雲K3-35.5で水質マザー放射が検出されました.
- マザーは磁気化されたトーラス (半径~85AU) において,また,双極性葉に相当な距離 (~5,000AU) において発見されました.
- K3-35からのプレセッシングジェットは,遠くのマザーを興奮させるのに関与している可能性が高い.
結論:
- 水質マザーの検出は,惑星の星雲における分子破壊の確立されたモデルに挑戦しています.
- K3-35は,この巨大恒星と惑星性星雲の間の移行段階が,水質マザー放射を宿す可能性があるという証拠を提供します.
- 双極葉のマザーの存在は,恒星の変容の間に複雑なジェット環境の相互作用を示唆しています.
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