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Proceedings Paper

Cepheid observations by long-baseline interferometry with FLUOR/IOTA
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Paper 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.

Paper Details

Date Published: 5 July 2000
PDF: 5 pages
Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390252
Show Author Affiliations
Pierre Kervella, European Southern Observatory (Germany)
Vincent Coude du Foresto, Observatoire de Paris-Meudon (France)
Wesley A. Traub, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Marc G. Lacasse, Harvard-Smithsonian Ctr. for Astrophysics (United States)

Published in SPIE Proceedings Vol. 4006:
Interferometry in Optical Astronomy
Pierre J. Lena; Andreas Quirrenbach, Editor(s)

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