Modelling the Phase-Locked Pulsations of a P=14d EROS Star

Details Modelling the Phase-Locked Pulsations of a P=14d EROS Star Modelling the Phase-Locked Pulsations of a P=14d EROS Star

1997-07-21

arxiv.org/abs/astro-ph/9707234v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the Twelfth IAP Colloquium on "Variable Stars and the Astrophysical Returns of Microlensing Surveys", Paris, Ed

Scientific paper

The Fourier spectral analysis of this object suggests a nonlinear pulsation of period approximately 14d with a 3:2 frequency lock between two vibrational modes. We discuss an extensive search that we have performed in the L, M, Teff space for models of period 14 - 16 days that exhibit this particular resonance. We find models satisfying the resonance constraints both in the Cepheid and in the post AGB regimes. The nonlinear pulsations of several candidates are presented. The nature of the star remains a mystery as none of the models satisfies all the observational constraints.

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