Non-radial oscillation modes with long lifetimes in giant stars

Joris De Ridder (), Caroline Barban, Frédéric Baudin, Fabien Carrier, Artie P. Hatzes, Saskia Hekker, Thomas Kallinger, Werner W. Weiss, Annie Baglin, Michel Auvergne, Réza Samadi, Pierre Barge and Magali Deleuil
Additional contact information
Joris De Ridder: Instituut voor Sterrenkunde, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
Caroline Barban: LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon, France
Frédéric Baudin: Institut d’Astrophysique Spatiale, UMR 8617 CNRS-Université Paris XI, Campus d’Orsay
Fabien Carrier: Instituut voor Sterrenkunde, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
Artie P. Hatzes: Thüringer Landessternwarte
Saskia Hekker: Instituut voor Sterrenkunde, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
Thomas Kallinger: Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria
Werner W. Weiss: Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria
Annie Baglin: LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon, France
Michel Auvergne: LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon, France
Réza Samadi: LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon, France
Pierre Barge: Laboratoire d’Astrophysique de Marseille, OAMP, Université Aix-Marseille & CNRS, 38 rue Frédéric Joliot Curie, 13388 Marseille 13, France
Magali Deleuil: Laboratoire d’Astrophysique de Marseille, OAMP, Université Aix-Marseille & CNRS, 38 rue Frédéric Joliot Curie, 13388 Marseille 13, France

Nature, 2009, vol. 459, issue 7245, 398-400

Abstract: Taking the pulse of red giants When main-sequence stars like the Sun near the end of their life, they expand to become oscillating red giants. Such evolved stars could in principle provide stringent tests of stellar theory via analysis of radial and non-radial stellar oscillations. Until now it has been unclear whether non-radial modes are observable at all in red giants. De Ridder et al. now report the presence of both radial and non-radial oscillations in over 300 giant stars. For some red giants, mode lifetimes are of the order of a month. Current stellar evolution theory cannot account for these observations.

Date: 2009
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DOI: 10.1038/nature08022

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