首页> 外文期刊>Nature >Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes
【24h】

Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes

机译:重力主导的混合模式揭示了红巨星的快速核旋转

获取原文
获取原文并翻译 | 示例
           

摘要

When the core hydrogen is exhausted during stellar evolution, the central region of a star contracts and the outer envelope expands and cools, giving rise to a red giant. Convection takes place over much of the star's radius. Conservation of angular momentum requires that the cores of these stars rotate faster than their envelopes; indirect evidence supports this1'2. Information about the angular-momentum distribution is inaccessible to direct observations, but it can be extracted from the effect of rotation on oscillation modes that probe the stellar interior. Here we report an increasing rotation rate from the surface of the star to the stellar core in the interiors of red giants, obtained using the rotational frequency splitting of recently detected 'mixed modes"'4. By comparison with theoretical stellar models, we conclude that the core must rotate at least ten times faster than the surface. This observational result confirms the theoretical prediction of a steep gradient in the rotation profile towards the deep stellar interior1-5'6.
机译:当恒星演化过程中核心氢被耗尽时,恒星的中心区域收缩,外壳膨胀并冷却,从而产生红色巨人。对流发生在恒星的大部分半径上。保持角动量需要这些恒星的核心旋转得快于其包络。间接证据支持这一点[1] 2。有关角动量分布的信息无法直接观察,但可以从旋转对探测恒星内部的振荡模式的影响中提取。在这里,我们报道了通过使用最近检测到的“混合模式” 4的旋转频率分裂获得的从红色巨星内部的恒星表面到恒星核心的旋转速率不断增加。与理论恒星模型相比,我们得出结论:核心的旋转速度至少必须比表面快十倍,这一观测结果证实了旋转剖面朝向深恒星内部1-5'6的陡峭梯度的理论预测。

著录项

  • 来源
    《Nature》 |2012年第7379期|p.55-57|共3页
  • 作者单位

    InstituutvoorSterrenkunde, KatholiekeUniversiteitLeuven,3001 Leuven, Belgium;

    Institutd'Astrophysiqueetde Geophysiquedel'UniversitedeLiege,4000 Liege,Belgium;

    InstituutvoorSterrenkunde, KatholiekeUniversiteitLeuven,3001 Leuven, Belgium,InstitutfiirAstronomieder Universitat Wien, Tiirkenschanzstra Be 17,1180 Wien, Austria,InstituutvoorSterrenkunde, KatholiekeUniversiteitLeuven,3001 Leuven, Belgium;

    InstituutvoorSterrenkunde, KatholiekeUniversiteitLeuven,3001 Leuven, Belgium,Afdeling Sterrenkunde, Institute for Mathematics Astrophysics and Particle Physics (IMAPP), Radboud University Nijmegen, 6500GL Nijmegen, The Netherlands;

    Laboratoire Astrophysique, Instrumentation et Moderation (AIM), CEA/DSM-CNRS-Universite Paris Diderot;

    Institutde Recherche sur les lois Fondamentalesde I'Univers/ Service d'Astrophysique (IRFU/Sap), Centre de Saclay, 91191 Gif-sur-Yvette Cedex, France;

    Astronomical Institute 'Anton Pannekoek, University of Amsterdam, Science Park 904,1098 XH Amsterdam,The Netherlands,School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B152TT, UK;

    Institutd'Astrophysiqueetde Geophysiquedel'UniversitedeLiege,4000 Liege,Belgium;

    Laboratoire d'etudes spatiales etd'instrumentation (LESIA), CNRS, Universite Pierre et Marie Curie, Universite Denis Diderot, Observatoi rede Paris, 92195 Meudon Cedex, France;

    Observatoirede Geneve, Universite de Geneve, 51 Ch.des Maillettes, 1290 Sauverny, Switzerland;

    Sydney Institute for Astronomy (SlfA), School of Physics, University of Sydney 2006, Australia;

    School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B152TT, UK;

    Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark;

    InstituutvoorSterrenkunde, KatholiekeUniversiteitLeuven,3001 Leuven, Belgium;

    InstituutvoorSterrenkunde, KatholiekeUniversiteitLeuven,3001 Leuven, Belgium;

    Department of Astronomy and Physics, Saint Marys University, Halifax, NS B3H 3C3, Canada;

    Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark;

    School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B152TT, UK;

    Institutd'Astrophysiqueetde Geophysiquedel'UniversitedeLiege,4000 Liege,Belgium;

    Sydney Institute for Astronomy (SlfA), School of Physics, University of Sydney 2006, Australia;

    Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark;

    Orbital Sciences Corporation/NASA Ames Research Center, Moffett Field, 94035 California, USA;

    Orbital Sciences Corporation/NASA Ames Research Center, Moffett Field, 94035 California, USA;

    Orbital Sciences Corporation/NASA Ames Research Center, Moffett Field, 94035 California, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号