| Issue |
EAS Publications Series
Volume 63, 2013
New Advances in Stellar Physics: From Microscopic to Macroscopic Processes
|
|
|---|---|---|
| Page(s) | 47 - 52 | |
| Section | Key Observations for Stellar Modelling | |
| DOI | https://doi.org/10.1051/eas/1363005 | |
| Published online | 19 December 2013 | |
G. Alecian, Y. Lebreton, O. Richard and G. Vauclair (eds)
EAS Publications Series, 63 (2013) 47–52
Hydrodynamic cycles in RR Lyrae stars
1 Université Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, UMR 7293, Parc Valrose, 06108 Nice Cedex 02, France
2 Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA
We present a detailed atmospheric dynamics study of Blazhko and nonBlazhko RR ab stars, using a high-resolution spectroscopic survey. We derived the dynamical parameters: dynamical accelerations, radius variations, rise time, shock amplitudes, full width at half maximum, and their variation during the Blazhko modulation, and we highlight the relationship between period changes and variation in dynamical parameters over multi- Blazhko cycles. We discuss the origin of the Blazhko effect, giving a new empirical side for further theoretical models.
© EAS, EDP Sciences, 2013