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

Author

Listed:
  • Paul G. Beck

    (Instituut voor Sterrenkunde, Katholieke Universiteit Leuven)

  • Josefina Montalban

    (Institut d’Astrophysique et de Géophysique de l’Université de Liège)

  • Thomas Kallinger

    (Instituut voor Sterrenkunde, Katholieke Universiteit Leuven
    Institut für Astronomie der Universität Wien)

  • Joris De Ridder

    (Instituut voor Sterrenkunde, Katholieke Universiteit Leuven)

  • Conny Aerts

    (Instituut voor Sterrenkunde, Katholieke Universiteit Leuven
    Afdeling Sterrenkunde, Institute for Mathematics Astrophysics and Particle Physics (IMAPP), Radboud University Nijmegen)

  • Rafael A. García

    (Laboratoire Astrophysique, Instrumentation et Modélisation (AIM), CEA/DSM—CNRS—Université Paris Diderot; Institut de Recherche sur les lois Fondamentales de l'Univers/Service d’Astrophysique (IRFU/Sap), Centre de Saclay)

  • Saskia Hekker

    (Astronomical Institute 'Anton Pannekoek', University of Amsterdam
    School of Physics and Astronomy, University of Birmingham)

  • Marc-Antoine Dupret

    (Institut d’Astrophysique et de Géophysique de l’Université de Liège)

  • Benoit Mosser

    (Laboratoire d’études spatiales et d’instrumentation (LESIA), CNRS, Université Pierre et Marie Curie, Université Denis Diderot)

  • Patrick Eggenberger

    (Observatoire de Genève, Université de Genève)

  • Dennis Stello

    (Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney 2006)

  • Yvonne Elsworth

    (School of Physics and Astronomy, University of Birmingham)

  • Søren Frandsen

    (Aarhus University)

  • Fabien Carrier

    (Instituut voor Sterrenkunde, Katholieke Universiteit Leuven)

  • Michel Hillen

    (Instituut voor Sterrenkunde, Katholieke Universiteit Leuven)

  • Michael Gruberbauer

    (Saint Marys University, Halifax, NS B3H 3C3, Canada)

  • Jørgen Christensen-Dalsgaard

    (Aarhus University)

  • Andrea Miglio

    (School of Physics and Astronomy, University of Birmingham)

  • Marica Valentini

    (Institut d’Astrophysique et de Géophysique de l’Université de Liège)

  • Timothy R. Bedding

    (Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney 2006)

  • Hans Kjeldsen

    (Aarhus University)

  • Forrest R. Girouard

    (Orbital Sciences Corporation/NASA Ames Research Center)

  • Jennifer R. Hall

    (Orbital Sciences Corporation/NASA Ames Research Center)

  • Khadeejah A. Ibrahim

    (Orbital Sciences Corporation/NASA Ames Research Center)

Abstract

The core values of red giant stars The core rotation rate of a star, a key indicator of its evolutionary state, cannot be measured directly because the core is inaccessible to direct observation. This paper presents a method for calculating core rotation in an evolved star. The Fourier spectra of brightness variations of four stars derived from Kepler spacecraft data were used to measure the rotational frequency splitting of the recently identified 'mixed modes' caused by rotation in red giant stars. The results suggest that the core of a red giant rotates at least ten times faster than the surface.

Suggested Citation

  • Paul G. Beck & Josefina Montalban & Thomas Kallinger & Joris De Ridder & Conny Aerts & Rafael A. García & Saskia Hekker & Marc-Antoine Dupret & Benoit Mosser & Patrick Eggenberger & Dennis Stello & Yv, 2012. "Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes," Nature, Nature, vol. 481(7379), pages 55-57, January.
    • Handle: RePEc:nat:nature:v:481:y:2012:i:7379:d:10.1038_nature10612
    DOI: 10.1038/nature10612
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