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2002•International Astronomical Union ColloquiumOpen access

Nonlinear Convective Pulsation Models of Second Overtone SMC Cepheids

M. Marconi, G. Bono, F. Caputo

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Abstract

Abstract Nonlinear convective pulsation models representative of SMC Cepheids pulsating in the second overtone mode are presented. Model predictions are compared with observations and implications are derived for second overtone selection criteria. The role of overtone Cepheids as distance indicators is finally investigated and the derived distance scale is at odds with the so called short distance scale.

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Abstract Nonlinear convective pulsation models representative of SMC Cepheids pulsating in the second overtone mode are presented. Model predictions are compared with observations and implications are derived for second overtone selection criteria. The role of overtone Cepheids as distance indicators is finally investigated and the derived distance scale is at odds with the so called short distance scale.

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Available abstract

Abstract Nonlinear convective pulsation models representative of SMC Cepheids pulsating in the second overtone mode are presented. Model predictions are compared with observations and implications are derived for second overtone selection criteria. The role of overtone Cepheids as distance indicators is finally investigated and the derived distance scale is at odds with the so called short distance scale.

Key concepts: Cepheid variable, Overtone, Nonlinear system, Physics, Odds, Scale (ratio), Convection, Astrophysics

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