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Hydrodynamic cycles in RR Lyrae stars

Published online by Cambridge University Press:  19 December 2013

M. Chadid  and
G.W. Preston
M. Chadid
Affiliation:
Université Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, UMR 7293, Parc Valrose, 06108 Nice Cedex 02, France
G.W. Preston
Affiliation:
Université Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, UMR 7293, Parc Valrose, 06108 Nice Cedex 02, France
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Abstract

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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 47 - 52
Copyright
© EAS, EDP Sciences, 2013

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References

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