EPJ Web of Conferences
Volume 43, 201340th Liège International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs
|Number of page(s)||7|
|Published online||21 March 2013|
Mode lifetime and associated scaling relations
1 LESIA, UMR8109, Observatoire de Paris, Université Pierre et Marie Curie, Université Denis Diderot, 92195 Meudon Cedex, France
2 Institut d'Astrophysique Spatiale, CNRS, Université Paris XI, 91405 Orsay Cedex, France
3 Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, 4000 Liège, Belgium
4 Georg-August-Universität Göttingen, Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
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Thanks to the CoRoT and Kepler spacecrafts, scaling relations (linking seismic indices and global stellar parameters) are becoming the cornerstone of ensemble asteroseismology. Among them, the relation between the cut-off frequency and the frequency of the maximum in the power spectrum of solar-like pulsators as well as the relation between mode lifetime and the effective temperature remain poorly understood. However, a solid theoretical background is essential to assess the accuracy of those relations and subsequently of the derived stellar parameters. We will thus present recent advances on the understanding of the underlying mechanisms governing those relations and show that the physics of mode lifetime (thus of mode damping) plays a major role.
© Owned by the authors, published by EDP Sciences, 2013
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