Period doubling in kepler RR lyrae stars

WG#13 members

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The origin of the conspicuous amplitude and phase modulation of the RR Lyrae pulsation—known as the Blazhko effect—is still a mystery more than 100 years since its discovery. With the help of the Kepler space telescope we have revealed a new and unexpected phenomenon: period doubling in RR Lyr— the eponym and prototype of its class—as well as in other Kepler Blazhko RR Lyrae stars. We have found that period doubling is directly connected to the Blazhko modulation. Furthermore, with hydrodynamic model calculations we have succeeded in reproducing the period doubling and proved that the root cause of this effect is a high order resonance (9:2) between the fundamental mode and the ninth radial overtone, which is a strange mode. We discuss the implications of these recent findings on our understanding of the century-old Blazhko problem.

Original languageEnglish
Title of host publicationStellar Pulsations - Impact of New Instrumentation and New Insights
PublisherSpringer Netherlands
Pages81-84
Number of pages4
Volume31
ISBN (Print)9783642296291
DOIs
Publication statusPublished - Jan 1 2013
Event20th Conference on Stellar Pulsations, 2011 - Granada, Spain
Duration: Sep 5 2011Sep 9 2011

Other

Other20th Conference on Stellar Pulsations, 2011
CountrySpain
CityGranada
Period9/5/119/9/11

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Computer Science Applications
  • Spectroscopy
  • Space and Planetary Science
  • Nuclear and High Energy Physics

Cite this

WG#13 members (2013). Period doubling in kepler RR lyrae stars. In Stellar Pulsations - Impact of New Instrumentation and New Insights (Vol. 31, pp. 81-84). Springer Netherlands. https://doi.org/10.1007/978-3-642-29630-7_16