Issue EAS Publications Series Volume 6, 2003 Observing with the VLTI Page(s) 265 DOI 10.1051/eas:2003026

Observing with the VLTI
G. Perrin and F. Malbet (eds)
EAS Publications Series, Vol. 6, 2003
DOI: 10.1051/eas:2003026

Calibrating the Cepheid Period-Luminosity relation with the VLTI

M. Marengo¹, M. Karovska¹, D. Sasselov¹, C. Papaliolios¹, J.T. Armstrong² and T.E. Nordgren<sup>3

1</sup>  Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
²  Naval Research Laboratory, Code 7210, Washington, DC 20375, USA
³  University of Redlands, 1200 E Colton Ave, Redlands, CA, USA

Abstract
The VLTI is the ideal instrument for measuring the distances of nearby Cepheids with the Baade-Wesselink method, allowing an accurate recalibration of the Cepheid Period-Luminosity relation. The high accuracy required by such measurement, however, can only be reached taking into account the effects of limb darkening, and its dependence on the Cepheid pulsations. We present here our new method to compute phase- and wavelength-dependent limb darkening profiles, based on hydrodynamic simulation of Classical Cepheid atmospheres.

© EAS, EDP Sciences 2003

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