Issue |
EPJ Web of Conferences
Volume 43, 2013
40th Liège International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs
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|
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Article Number | 03011 | |
Number of page(s) | 7 | |
Section | Red Giants | |
DOI | https://doi.org/10.1051/epjconf/20134303011 | |
Published online | 21 March 2013 |
https://doi.org/10.1051/epjconf/20134303011
Red giants rotational splittings
1 Institut d‘Astrophysique et de Géophysique de l'Université de Liège, Belgium
2 Observatoire de Paris, LESIA, CNRS UMR 8109, 92195 Meudon, France
3 Georg-August-Universität Göttingen, Germany
a e-mail: rhita-maria.ouazzani@ulg.ac.be
The space missions CoRoT and Kepler provide high quality data that allow to test the transport of angular momentum in stars by the seismic determination of the internal rotation profile. Our aim is to test the validity of the seismic diagnostics for red giant rotation that are based on a perturbative method and to investigate the oscillation spectra when the validity does not hold. We use a non-perturbative approach implemented in the ACOR code [1] that accounts for the effect of rotation on pulsations, and solves the pulsations eigenproblem directly for dipolar oscillation modes. We find that the limit of the perturbation to first order can be expressed in terms of the core rotation and the period separation between consecutive dipolar modes. Above this limit, each family of modes with different azimuthal symmetry m, has to be considered separately. For rapidly rotating red giants, new seismic diagnostics can be found for rotation by exploiting the differences between the period spacings associated with each m-family of modes.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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