Cepheid Limb Darkening Models for the VLTI

Details Cepheid Limb Darkening Models for the VLTI Cepheid Limb Darkening Models for the VLTI

2003-03-19

arxiv.org/abs/astro-ph/0303446v1

Astrophys.Space Sci. 286 (2003) 185-190

Astronomy and Astrophysics

Astrophysics

6 pages, 3 postscript figures, to appear in the proceedings of the JENAM 2002 Workshop WS-VLTI "The Very Large Telescope Inter

Scientific paper

10.1023/A:1026171925432

We present a new method to compute wavelength- and phase-dependent limb darkening corrections for classical Cepheids. These corrections are derived from hydrodynamic simulations and radiative transfer modeling with a full set of atomic and molecular opacities. Comparison with hydrostatic models having the same stellar parameters show a larger limb darkening for most phases in our models, and temporal variations related to the hydrodynamics of the stellar pulsation. We assess the implications of our results with respect to the geometric Baade-Wesselink method, which uses interferometric measurements of Cepheid angular diameters to determine their distances and radii. The relevance of the hydrodynamic effects predicted by our model on the limb darkening of pulsating Cepheids is finally discussed in terms of the predicted capabilities of the VLTI.

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