Turbulent convection in the classical variable stars

J. Robert Buchler, Zoltán Kolláth

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We give a status report of convective Cepheid and RR Lyrae model pulsations. Some striking successes can be reported, despite the use of a rather simple treatment of turbulent convection with a 1D time-dependent diffusion equation for the turbulent energy. It is now possible to obtain stable double-mode (beat) pulsations in both Cepheid and RR Lyrae models with astrophysical parameters, i.e. periods and amplitude ratios, that are in agreement with observations. The turbulent convective models, however, have difficulties giving global agreement with the observations. In particular, the Magellanic Cloud Cepheids which have been observed in connection with the microlensing projects have imposed novel observational constraints because of the low metallicity of the MCs.

Original languageEnglish
Pages (from-to)39-58
Number of pages20
JournalAnnals of the New York Academy of Sciences
Volume898
Publication statusPublished - Jan 1 2000

Keywords

  • Cepheids
  • Convection
  • Hydrodynamics
  • Pulsating stars
  • RR Lyrae
  • Turbulence
  • Variable stars

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

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