The Cepheid Phase Lag Revisited

Details The Cepheid Phase Lag Revisited The Cepheid Phase Lag Revisited

2007-03-21

arxiv.org/abs/astro-ph/0703568v3

Astronomy and Astrophysics

Astrophysics

11 pages, 8 figures, accepted for publication in ApJ, minor revisions in the text and figures, (black and white version availa

Scientific paper

10.1086/520917

We compute the phase lags between the radial velocity curves and the light curves $\Delta \Phi_1= \phi^{V_r}_1 - \phi^{mag}_1$ for classical Cepheid model sequences both in the linear and the nonlinear regimes. The nonlinear phase lags generally fall below the linear ones except for high period models where they lie above, and of course for low pulsation amplitudes where the two merge. The calculated phase lags show good agreement with the available observational data of normal amplitude Galactic Cepheids. The metallicity has but a moderate effect on the phase lag, while the mass-luminosity relation and the parameters of the turbulent convective model (time-dependent mixing length) mainly influence the modal selection and the period, which is then reflected in the period -- $\Delta \Phi_1$ diagram. We discuss the potential application of this observable as a discriminant for pulsation modes and as a test for ultra-low amplitudes (ULA) pulsation.

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