Turbulent convective cepheid models: Linear properties

P. A. Yecko, Z. Kolláth, J. R. Buchler

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

A one-dimensional turbulent convection model in the form of a time-dependent diffusion equation for the turbulent energy is incorporated into our numerical pulsation code. The effect of turbulent convection on the structural rearrangement of the static equilibrium star is taken into account, and the linear eigenvalues (periods and growth-rates) for the complete turbulent convective nonadiabatic pulsations of the equilibrium models are calculated. The linearized code allows us to perform efficiently a systematic survey of the stability of Cepheid models for a wide range of astrophysical parameters (L,M,Teff) and the turbulent convective parameters. A sensitivity analysis of the properties of several sequences of Galactic Cepheids is performed with the goal of using observational constraints, such as the shape and location of the fundamental and first overtone instability strips, to make a first calibration of the turbulent convective parameters. The locations of the red and blue edges of the fundamental and first overtone instability strips and the overall strip widths are largely determined by the parameters that determine the mixing length, and strengths of the eddy viscosity and of the convective flux. The remaining parameters can be used for fine-tuning agreement with observations.

Original languageEnglish
Pages (from-to)553-564
Number of pages12
JournalAstronomy and Astrophysics
Volume336
Issue number2
Publication statusPublished - Dec 1 1998

Keywords

  • Convection
  • Instabilities
  • Stars: oscillations
  • Stars: variables: RR Lyr
  • Stars: variables: cepheids
  • Turbulence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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