Uncovering hidden modes in RR lyrae stars

L. Molnár, Z. Kolláth, R. Szabó

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

1 Citation (Scopus)

Abstract

The Kepler space telescope revealed new, unexpected phenomena in RR Lyrae stars: period doubling and the possible presence of additional modes. Identifying these modes is complicated because they blend in the rich features of the Fourier-spectrum. Our hydrodynamic calculations uncovered that a “hidden” mode, the 9th overtone is involved in the period doubling phenomenon. The period of the overtone changes by up to 10% compared to the linear value, indicating a very significant nonlinear period shift caused by its resonance with the fundamental mode. The observations also revealed weak peaks that may correspond to the first or second overtones. These additional modes are often coupled with period doubling. We investigated the possibilities and occurrences of mutual resonances between the fundamental mode and multiple overtones in our models. These theoretical findings can help interpreting the origin and nature of the “hidden” modes may be found in the high quality light curves of space observatories.

Original languageEnglish
Title of host publicationStellar Pulsations - Impact of New Instrumentation and New Insights
EditorsL.A. Balona, J.C. Suarez, R. Garrido, J. Christensen-Dalsgaard
PublisherSpringer Netherlands
Pages185-189
Number of pages5
ISBN (Print)9783642296291
DOIs
Publication statusPublished - Jan 1 2013
Event20th Conference on Stellar Pulsations, 2011 - Granada, Spain
Duration: Sep 5 2011Sep 9 2011

Publication series

NameAstrophysics and Space Science Proceedings
Volume31
ISSN (Print)1570-6591
ISSN (Electronic)1570-6605

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

Molnár, L., Kolláth, Z., & Szabó, R. (2013). Uncovering hidden modes in RR lyrae stars. In L. A. Balona, J. C. Suarez, R. Garrido, & J. Christensen-Dalsgaard (Eds.), Stellar Pulsations - Impact of New Instrumentation and New Insights (pp. 185-189). (Astrophysics and Space Science Proceedings; Vol. 31). Springer Netherlands. https://doi.org/10.1007/978-3-642-29630-7_35