Cepheid observations by long-baseline interferometry with FLUOR/IOTA

Pierre Kervella; Vincent Coude du Foresto; Wesley A. Traub; Marc G. Lacasse

doi:10.1117/12.390252

5 July 2000 Cepheid observations by long-baseline interferometry with FLUOR/IOTA

Pierre Kervella, Vincent Coude du Foresto, Wesley A. Traub, Marc G. Lacasse

Proceedings Volume 4006, Interferometry in Optical Astronomy; (2000) https://doi.org/10.1117/12.390252
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

We report interferometric observations of the classical galactic Cepheid (zetz) Gem with FLUOR (Fiber Linked Unit for Optical Recombination), installed at the IOTA (Infrared Optical Telescope Array) interferometer. Thanks to the high precision of the visibility measurements with FLUOR, it has been possible to estimate its mean uniform disk angular diameter to a relative precision of 5% ((theta) _ud equals 1.98 +/- 0.09 mas). Variations of the angular diameter of (zetz) Gem were marginally detected, with an amplitude of (Delta) (theta) _ud equals 0.38 +/- 0.23 mas, but further observations should allow a more precise estimation of this value. The feasibility of the observation of Cepheids with the VLTI is also evaluated. When in operation, the VLTI will allow the precise measurement of the angular diameters of a large number of Cepheids. The zero point of the period- luminosity relation could then be set with a precision of less than 0.1 mag.

Citation Download Citation

Pierre Kervella, Vincent Coude du Foresto, Wesley A. Traub, and Marc G. Lacasse "Cepheid observations by long-baseline interferometry with FLUOR/IOTA", Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); https://doi.org/10.1117/12.390252

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