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

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, Yvonne Elsworth, Søren Frandsen, Fabien Carrier, Michel Hillen, Michael Gruberbauer, Jørgen Christensen-Dalsgaard, Andrea Miglio, Marica Valentini, Timothy R. Bedding, Hans Kjeldsen, Forrest R. Girouard, Jennifer R. Hall and Khadeejah A. Ibrahim
Additional contact information
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
Joris De Ridder: Instituut voor Sterrenkunde, Katholieke Universiteit Leuven
Conny Aerts: Instituut voor Sterrenkunde, Katholieke Universiteit Leuven
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
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

Nature, 2012, vol. 481, issue 7379, 55-57

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.

Date: 2012
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DOI: 10.1038/nature10612

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