Turbulent convection in the classical variable stars

J. Robert Buchler, Z. 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 - 2000

Fingerprint

Convection
Stars

Keywords

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

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Turbulent convection in the classical variable stars. / Buchler, J. Robert; Kolláth, Z.

In: Annals of the New York Academy of Sciences, Vol. 898, 2000, p. 39-58.

Research output: Contribution to journalArticle

@article{b807c4fae4ae4ce785a94ba5b95c5cdf,
title = "Turbulent convection in the classical variable stars",
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.",
keywords = "Cepheids, Convection, Hydrodynamics, Pulsating stars, RR Lyrae, Turbulence, Variable stars",
author = "Buchler, {J. Robert} and Z. Koll{\'a}th",
year = "2000",
language = "English",
volume = "898",
pages = "39--58",
journal = "Annals of the New York Academy of Sciences",
issn = "0077-8923",
publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - Turbulent convection in the classical variable stars

AU - Buchler, J. Robert

AU - Kolláth, Z.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

KW - Cepheids

KW - Convection

KW - Hydrodynamics

KW - Pulsating stars

KW - RR Lyrae

KW - Turbulence

KW - Variable stars

UR - http://www.scopus.com/inward/record.url?scp=0034035514&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034035514&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034035514

VL - 898

SP - 39

EP - 58

JO - Annals of the New York Academy of Sciences

JF - Annals of the New York Academy of Sciences

SN - 0077-8923

ER -