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Calibrating the Cepheid Period-Luminosity relation with the VLTI

Published online by Cambridge University Press:  31 January 2003

G. Perrin ,
F. Malbet ,
M. Marengo ,
M. Karovska ,
D. Sasselov ,
C. Papaliolios ,
J. T. Armstrong  and
T. E. Nordgren
M. Marengo
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
M. Karovska
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
D. Sasselov
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
C. Papaliolios
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
J. T. Armstrong
Affiliation:
Naval Research Laboratory, Code 7210, Washington, DC 20375, USA
T. E. Nordgren
Affiliation:
University of Redlands, 1200 E Colton Ave, Redlands, CA, USA
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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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 6: Observing with the VLTI , 2003 , pp. 265
Copyright
© EAS, EDP Sciences, 2003

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