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Cepheid distances from Interferometry

Long baseline interferometry is now able to resolve the pulsational change of the angular diameter of a significant number of Cepheids in the solar neighborhood. This allows the application of a new version of the Baade-Wesselink (BW) method to measure their distance, for which we do not need to estimate the star's temperature. Using angular diameter measurements from the VLT Interferometer, we derived the distances to four nearby Cepheids. For three additional stars, we obtained average values of their angular diameters. Based on these new measurements and already existing data, we derived calibrations of the Period-Luminosity and Period-Radius relations. We also obtained reliable surface brightness-color relations, that can be employed for the infrared surface brightness version of the BW method.

preprint2005arXivOpen access
Pierre Kervella
astro-ph
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Pierre Kervella

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