Magellanic cloud cepheids: Pulsational and evolutionary modelling vs. observations

J. R. Buchler, Z. Kolláth, J. P. Beaulieu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The pulsational properties of the Cepheid models along the evolutionary tracks from the Padova group (Girardi et al.), as calculated with our turbulent convective pulsation code, are in good agreement with the resonance constraints imposed by the observational OGLE-2 data of the Small and Large Magellanic Clouds. Our study suggests that the P4/P1 = 1/2 resonance for the overtone Cepheids occurs for periods clustering around 4.2 d, in disagreement with the suggestion of Antonello & Poretti based on the observations of light curves, but in agreement with Kienzle et al. and Feuchtinger et al. For the fundamental Cepheids the lowest order Fourier decomposition coefficients from the light curves, viz. R21 and ø21 can be used to locate the resonance region, but not so for the first overtone Cepheids. Here, the radial velocity curves can be used to locate the overtone resonance region, or in their absence, one needs to resort to numerical hydrodynamic modelling.

Original languageEnglish
Pages (from-to)643-650
Number of pages8
JournalAstronomy and Astrophysics
Volume423
Issue number2
DOIs
Publication statusPublished - Aug 2004

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Magellanic clouds
harmonics
light curve
modeling
radial velocity
suggestion
hydrodynamics
decomposition
curves
coefficients

Keywords

  • Galaxies: Magellanic Clouds
  • Stars: distances
  • Stars: evolution
  • Stars: oscillations
  • Stars: variables: Cepheids

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Magellanic cloud cepheids : Pulsational and evolutionary modelling vs. observations. / Buchler, J. R.; Kolláth, Z.; Beaulieu, J. P.

In: Astronomy and Astrophysics, Vol. 423, No. 2, 08.2004, p. 643-650.

Research output: Contribution to journalArticle

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