The space photometry revolution and our understanding of RR Lyrae stars

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.

arXiv commentProceedings of the CoRoT Symposium 3 / Kepler KASC-7 joint meeting, Toulouse, July 2014. To be published by EPJ Web of Conferences

References in corpus (16)

• The K2 Mission: Characterization and Early results
• Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars
• First Kepler results on RR Lyrae stars
• Flavours of variability: 29 RR Lyrae stars observed with Kepler
• On the Blazhko Effect in RR Lyrae Stars
• Kepler photometry of the prototypical Blazhko star RR Lyr: An old friend seen in a new light
• Period doubling bifurcation and high-order resonances in RR Lyrae hydrodynamical models
• Long time-scale behavior of the Blazhko effect from rectified Kepler data
• The complex case of V445 Lyr observed with Kepler: Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more
• Revisiting CoRoT RR Lyrae stars: detection of period doubling and temporal variation of additional frequencies
• The CoRoT star 105288363: strong cycle to cycle changes of the Blazhko modulation
• Nonlinear asteroseismology of RR Lyrae
• The Multi-periodic Blazhko Modulation of CZ Lacertae
• Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys
• The historical vanishing of the Blazhko effect of RR Lyr from GEOS and Kepler surveys
• Low-dimensional chaos in RR Lyrae models

Cited by in corpus (1)

• Giant star seismology