EPJ Web Conf.
Volume 160, 2017Seismology of the Sun and the Distant Stars 2016 – Using Today’s Successes to Prepare the Future – TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference
|Number of page(s)||7|
|Section||Seismology: Stars Near and in The Main Sequence|
|Published online||27 October 2017|
What CoRoT tells us about δ Scuti stars
Existence of a regular pattern and seismic indices to characterize stars
Observatoire de Paris, LESIA, UMR8109, Université Pierre et Marie Curie, Université Paris Diderot, PSL
2 Institut d'Astrophysique et Geophysique, University of Liège, Belgium
3 Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
4 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200B, 3001, Leuven, Belgium
5 Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto Portugal
6 Dept. Física Teórica y del Cosmos. University of Granada, 18071, Granada, Spain
7 Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
8 Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain
* e-mail: Eric.Michelatobspm.fr
Published online: 27 October 2017
Inspired by the so appealing example of red giants, where going from a handful of stars to thousands revealed the structure of the eigenspectrum, we inspected a large homogeneous set of around 1860 δ Scuti stars observed with CoRoT. This unique data set reveals a common regular pattern which appears to be in agreement with island modes featured by theoretical non-perturbative treatments of fast rotation. The comparison of these data with models and linear stability calculations suggests that spectra can be fruitfully characterized to first order by a few parameters which might play the role of seismic indices for δ Scuti stars, as Δv and vmax do for red giants. The existence of this pattern offers an observational support for guiding further theoretical works on fast rotation. It also provides a framework for further investigation of the observational material collected by CoRoT () and Kepler (). Finally, it sketches out the perspective of using δ Scuti stars pulsations for ensemble asteroseismology
© Owned by the authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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