Hydrodynamical survey of first-overtone cepheids

Michael Feuchtinger, J. Robert Buchler, Zoltán Kolláth

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Abstract

A hydrodynamical survey of the pulsational properties of first-overtone Galactic Cepheids is presented. The goal of this study is to reproduce their observed light and radial velocity curves. The comparison between the models and the observations is made in a quantitative manner on the level of the Fourier coefficients. Purely radiative models fail to reproduce the observed features, but convective models give good agreement. It is found that the sharp features in the Fourier coefficients are indeed caused by the P1/P4 = 2 resonance, despite the very large damping of the fourth overtone. For the adopted mass-luminosity relation, the resonance center lies near a period of 4d.2 ± 0d.3 as indicated by the observed radial velocity data rather than near 3d.2 as the light curves suggest.

Original languageEnglish
Pages (from-to)1056-1066
Number of pages11
JournalAstrophysical Journal
Volume544
Issue number2 PART 1
Publication statusPublished - Dec 1 2000

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Keywords

  • Cepheids
  • Convection
  • Hydrodynamics
  • Stars: oscillations
  • Turbulence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Feuchtinger, M., Buchler, J. R., & Kolláth, Z. (2000). Hydrodynamical survey of first-overtone cepheids. Astrophysical Journal, 544(2 PART 1), 1056-1066.