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Title: The space photometry revolution and our understanding of RR Lyrae stars
Authors: Szabó, R.
Benkö, J.M.
Paparó, M.
Chapellier, E.
Poretti, E.
Baglin, A.
Weiss, W.W.
Kolenberg, Katrien
Guggenberger, E.
Le Borgne, J.-F.
Issue Date: Nov-2014
Host Document: Proceedings of the CoRoT Symposium 3 / Kepler KASC-7 joint meeting
Series Title: to be published by EPJ Web of Conferences
Conference: CoRoT Symposium 3 / Kepler KASC-7 joint meeting location:Toulouse, France date:6-11 July 2014
Article number: eprint arXiv:1411.1543
Abstract: The study of RR Lyrae stars has recently been invigorated thanks to the long, uninterrupted, ultra-precise time series data provided by the Kepler and CoRoT space telescopes. We give a brief overview of the new observational findings concentrating on the connection between period doubling and the Blazhko modulation, and the omnipresence of additional periodicities in all RR Lyrae subtypes, except for non-modulated RRab stars. Recent theoretical results demonstrate that if more than two modes are present in a nonlinear dynamical system such as a high-amplitude RR Lyrae star, the outcome is often an extremely intricate dynamical state. Thus, based on these discoveries, an underlying picture of complex dynamical interactions between modes is emerging which sheds new light on the century-old Blazhko-phenomenon, as well. New directions of theoretical efforts, like multi-dimensional hydrodynamical simulations, future space photometric missions and detailed spectroscopic investigations will pave the way towards a more complete understanding of the atmospheric and pulsation dynamics of these enigmatic touchstone objects.
Publication status: published
KU Leuven publication type: IC-p
Appears in Collections:Institute of Astronomy

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