若い中間質量星の非常に規則的な高周波パルスモード
Timothy R Bedding1,2, Simon J Murphy3,4, Daniel R Hey3,4
1Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, Camperdown, New South Wales, Australia. tim.bedding@sydney.edu.au.
Nature
|May 15, 2020
まとめ
アステロシズモロジーは,新たに発見された定期的な高周波パルスシーケンスのおかげで,δ スクティの星におけるパルスモードを特定することができます. この画期的な発見は 中間質量星の内部構造を理解するのに役立ちます
科学分野:
- 天文学と天体物理学
- 恒星物理学
- アステロ地震学
背景:
- アステロシズモロジーは,恒星の内部構造を研究するために,恒星のパルス周波数を用いる.
- 以前の研究では 赤い巨星や白矮星のような様々な星の 脈動モードを成功裏に特定しました
- δ スクティ星は,中等質量パルス星のグループで,体系的なモード識別に抵抗した複雑なパルススペクトルを持っています.
研究 の 目的:
- 質量の中間のメインシーケンス星 (δ スクティ星) の決定的なモード識別を可能にします.
- ランダムな刺激と急速な回転によって引き起こされるパルスモードを特定する課題を克服する.
主な方法:
- 高周波パルスモードの検出 メインシーケンス60の中間質量星.
- 脈動スペクトルの分析により,非常に規則的なシーケンスが特定される.
- 宇宙運動と脈動モデリングを用いて,若い恒星連合の恒星メンバーの確認.
主要な成果:
- 60 δ スクティ星の高周波パルスモードの 驚くほど規則的なシーケンスの発見
- 恒星の決定的なモードの識別が成功しました
- 既知の若い星団のメンバーとしていくつかの星を識別する.
結論:
- この研究は δ スクティの星におけるモード識別のための新しい方法を確立している.
- この発見は 中間の質量の恒星の内部構造について 重要な洞察を与えてくれます
- この結果は,アステロシズモロジーを星動力学と人口研究と結びつけています.
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