数千 年 前 の 星 の 合併 から 生じ た 青い リング の 星雲
Keri Hoadley1, D Christopher Martin2, Brian D Metzger3,4
1Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA, USA. khoadley@caltech.edu.
Nature
|November 19, 2020
まとめ
研究者達は TYC 2597-735-1 という ユニークな青い星雲と その中心の星を観測し 最近の 星同士の融合を 明らかにしました これは 星が融合した後の 星進化の中間段階を研究する 珍しい機会です
科学分野:
- 天文学と天体物理学
- 星の進化について
- バイナリー星系
背景:
- 恒星融合は二重星の進化における一般的だが短い段階であり,非典型の恒星とコンパクトな物体の融合の形成に影響を与えます.
- 恒星の合併の以前の観測は 塵によって遮られ 最終状態の詳細な研究が妨げられました
研究 の 目的:
- 異常な恒星合併とその残骸を観察し分析する
- 星の合併の始まりと均衡の間の中間進化段階を研究する.
主な方法:
- 環状の紫外線星雲とその中心の星,TYC 2597-735-1の観測.
- TYC 2597-735-1のスペクトル解析は,Hα放出,放射速度の変化,赤外線過剰を含みます.
- 恒星の進化モデルとの比較
主要な成果:
- TYC 2597-735-1からの双極流出の発見,リングの星雲によって示される.
- TYC 2597-735-1は,異常に低い表面重力,明るさの衰退,および増殖の兆候を持つ古い星の特徴を示しています.
- 証拠によると TYC2597-735-1は 数千年前に 低質量伴星と 融合したそうです
結論:
- TYC 2597-735-1は 進行中の恒星の融合を 前例のない形で 見ることができます
- このシステムにより 進化の重要な段階で 融合過程を直接研究できます
- この発見は,恒星集団と 二重星系の進化の理解を深める.
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