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繰り返し発生する新星RS OphiuchichiからのX線を放射する衝撃波
J L Sokoloski1, G J M Luna, K Mukai
1Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, Massachusetts 02138, USA. jsokoloski@cfa.harvard.edu
Nature
|July 21, 2006
まとめ
新星と超新星は重元素を生み出します. 繰り返し発生する新星RS Ophiuchiの観測は,その爆発波が急速に減速したことを明らかにし,低質量噴射物と高質量白矮星,潜在的なタイプIア超新星祖先を示しています.
科学分野:
- 天文学と天体物理学について
- 宇宙元素の核合成について
- 恒星の進化について
背景:
- 新星や超新星のような恒星爆発は重元素の主要な源である.
- ノヴァの発生は,白矮星の表面熱核の脱走として理解されていますが,エジェクトの性質は不明です.
- 星雲の繰り返し発生する新星は,爆発のダイナミクスと元素の分布に関するユニークな洞察を提供します.
研究 の 目的:
- 繰り返し発生する新星RS Ophiuchiの噴火中のX線放射と爆破波のダイナミクスを調査する.
- 噴出物と白矮星の質量と構造を決定する.
- タイプIア超新星の祖先への影響を評価する.
主な方法:
- 繰り返し発生する新星RS Ophiuchiの噴火を研究するために,X線観測を用いた.
- 爆破波の背後から発生した硬いX線放射を分析した.
- 周りの星雲と相互作用する衝撃波の膨張と減速を調査した.
主要な成果:
- 噴火の初期段階における衝撃波の背後から放射される硬いX線放射を観測した.
- 爆破波は2日以内に自由に膨張し,星雲の相互作用により減速した.
- X線の急速な衰退は,標準的な球状の殻構造からの偏差を示唆し,低エジェクト質量と高い白矮星質量を示唆しています.
結論:
- RS Ophiuchiの急速な減速は,小型のエジェクト質量と高質量の白矮星を暗示しています.
- このシステムは,宇宙の膨張を理解するために不可欠なタイプIア超新星の潜在的な祖先です.
- これらの発見は,新星爆発のモデルと,銀河の化学的進化へのそれらの貢献を洗練します.
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