観測された中間質量ヘリウム星群が二重星系で剥離されている
M R Drout1,2, Y Götberg2, B A Ludwig1
1David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto, Toronto M5S 3H4, Canada.
まとめ
天文学者は新しい熱いヘリウム星を発見しました 二重相互作用によって形成されました これらの剥離された星は,剥離された封筒の超新星の祖先であり,恒星の進化に関する知識の空白を埋めるかもしれません.
科学分野:
- 星の天体物理学
- バイナリースター・エボリューション
背景:
- 巨大な恒星は バイナリ相互作用によって水素の封筒を失います
- 理論的なモデルは,このプロセスから熱いヘリウム星 (2〜8太陽質量) の集団を予測しています.
- 以前は"つだけ 星系が特定されていました
研究 の 目的:
- 潜在的ヘリウム星を特定し特徴づけること
- バイナリーストリッピングモデルによって予測された星の性質を調査する.
- 超大質量恒星の進化の経路を理解する
主な方法:
- 超紫外線光学を用いて candidate stripped helium starsを特定しました
- 25の候補星に光学スペクトル検査を行った.
- 温度,表面重力,表面組成を含む恒星の性質を分析した.
主要な成果:
- 双星運動を示す16の星を特定した.
- 確認された高温 (~60,000〜100,000 K) と高表面重力.
- 水素の欠乏した表面が 見つかりました
- 既知の恒星型の間のギャップを埋めました 恒星型の間のギャップを埋めました
結論:
- 特定された恒星は バイナリ・ストライプヘリウム恒星に関する 理論的な予測と一致しています
- これらの星は,サブ・ダワーフ・ヘリウム星と ウルフ・ライエット星との間の 欠けているリンクを表しています.
- 発見された集団は,剥離された封筒超新星の祖先として提案されています.
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