Do the magellanic cepheids pose a new puzzle?

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

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21 Citations (Scopus)

Abstract

The observed Magellanic Cloud (MC) Cepheid data pose a new challenge to both stellar structure and stellar evolution. The Fourier analysis of the LMC and SMC data indicate that the 2:1 resonance (P2/P0 = 0.5) between the fundamental mode of pulsation and the second overtone occurs with a period P0 of ≈ 10 days, just as in our Galaxy. The implications of this resonance are difficult to reconcile with linear radiative Cepheid models computed for the low metallicity of the MC. They also require a large upward shift in the mass-luminosity relation (MLR), seemingly larger than is comfortable for evolutionary calculations. The disagreement worsens if we interpret the structure in the first overtone Fourier parameters near 3 days as the result of an alleged resonance with the fourth overtone. In contrast to earlier expectations, the beat Cepheid data with P1/P0 ≈ 0.7, as well as those with P2/P1 ≈ 0.8, impose weak constraints, at best, on the MLRs.

Original languageEnglish
Pages (from-to)L83-L86
JournalAstrophysical Journal
Volume462
Issue number2 PART II
DOIs
Publication statusPublished - 1996

Keywords

  • Cepheids
  • Magellanic clouds
  • Stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Buchler, J. R., Kolláth, Z., Beaulieu, J. P., & Goupil, M. J. (1996). Do the magellanic cepheids pose a new puzzle? Astrophysical Journal, 462(2 PART II), L83-L86. https://doi.org/10.1086/310036