Reference : Seismic Evidence for a Rapidly Rotating Core in a Lower-giant-branch Star Observed wi...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/139444
Seismic Evidence for a Rapidly Rotating Core in a Lower-giant-branch Star Observed with Kepler
English
Deheuvels, S. [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA ; LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, CNRS, 5 Place Jules Janssen, F-92195 Meudon Cedex, France ; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA]
García, R. A. [Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA ; Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, centre de Saclay, F-91191 Gif-sur-Yvette, France]
Chaplin, W. J. [Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA ; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Basu, S. [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA]
Antia, H. M. [Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India]
Appourchaux, T. [Institut d'Astrophysique Spatiale, UMR8617, Université Paris XI, Bâtiment 121, F-91405 Orsay Cedex, France]
Benomar, O. [Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia]
Davies, G. R. [Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, centre de Saclay, F-91191 Gif-sur-Yvette, France]
Elsworth, Y. [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Gizon, L. [Institut für Astrophysik, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany ; Max-Planck-Institut für Sonnensystemforschung, D-37191 Katlenburg-Lindau, Germany]
Goupil, M. J. [LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, CNRS, 5 Place Jules Janssen, F-92195 Meudon Cedex, France]
Reese, Daniel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Regulo, C. [Instituto de Astrofsica de Canarias, E-38205 La Laguna, Tenerife, Spain ; Dpto de Astrofsica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain]
Schou, J. [W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305-4085, USA]
Stahn, T. [Institut für Astrophysik, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany]
Casagrande, L. [Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, The Australian National University, ACT 2611, Australia]
Christensen-Dalsgaard, J. [Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark]
Fischer, D. [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA]
Hekker, S. [Astronomical Institute "Anton Pannekoek," University of Amsterdam, Science Park 904, 1098 HX Amsterdam, The Netherlands]
Kjeldsen, H. [Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark]
Mathur, S. [High Altitude Observatory, NCAR, P.O. Box 3000, Boulder, CO 80307, USA]
Mosser, B. [LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, CNRS, 5 Place Jules Janssen, F-92195 Meudon Cedex, France]
Pinsonneault, M. [Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA ; Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA]
Valenti, J. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA]
Christiansen, J. L. [SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA]
Kinemuchi, K. [Bay Area Environmental Research Inst./NASA Ames Research Center, Moffett Field, CA 94035, USA]
Mullally, F. [SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA)]
1-Sep-2012
Astrophysical Journal
756
19
Yes (verified by ORBi)
International
0004-637X
1538-4357
[en] stars: evolution ; stars: individual: KIC 7341231 ; stars: interiors ; stars: oscillations
[en] Rotation is expected to have an important influence on the structure and the evolution of stars. However, the mechanisms of angular momentum transport in stars remain theoretically uncertain and very complex to take into account in stellar models. To achieve a better understanding of these processes, we desperately need observational constraints on the internal rotation of stars, which until very recently was restricted to the Sun. In this paper, we report the detection of mixed modes—i.e., modes that behave both as g modes in the core and as p modes in the envelope—in the spectrum of the early red giant KIC 7341231, which was observed during one year with the Kepler spacecraft. By performing an analysis of the oscillation spectrum of the star, we show that its non-radial modes are clearly split by stellar rotation and we are able to determine precisely the rotational splittings of 18 modes. We then find a stellar model that reproduces very well the observed atmospheric and seismic properties of the star. We use this model to perform inversions of the internal rotation profile of the star, which enables us to show that the core of the star is rotating at least five times faster than the envelope. This will shed new light on the processes of transport of angular momentum in stars. In particular, this result can be used to place constraints on the angular momentum coupling between the core and the envelope of early red giants, which could help us discriminate between the theories that have been proposed over the last few decades.
Researchers
http://hdl.handle.net/2268/139444
10.1088/0004-637X/756/1/19
http://cdsads.u-strasbg.fr/abs/2012ApJ...756...19D
http://de.arxiv.org/abs/1206.3312

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