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Proceedings Paper

Thermal infrared stellar interferometry using single-mode guided optics: first scientific results from the IOTA
Author(s): Bertrand P. Mennesson; Guy S. Perrin; Vincent Coude du Foresto; Gilles Chagnon; Cyril Ruilier; Sebastien Morel; Stephen T. Ridgway; Bruno Lopez; Patrick de Laverny; Wesley A. Traub; Nathaniel P. Carleton; Marc G. Lacasse
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Paper Abstract

We report on first scientific observations of a few bright late type stars by direct long baseline interferometry in the thermal infrared (3.4 to 4.1 microns) obtained with the TISIS (Thermal Infrared Stellar Interferometric Set-up) experiment of the IOTA (Infrared and Optical Telescope Array) interferometer. Beam combination is provided by a single-mode fluoride glass coupler optimized for operation in that wavelength domain and yielding visibility measurements with 2% typical relative accuracy. First precise estimations of uniform disk diameters for (alpha) Orionis, (alpha) Herculis, o Ceti and R Leonis are presented in the L band. Very large increase (50 to 70%) in apparent angular diameters have been found for the 2 Mira stars o Ceti and R Leonis with respect to previous measurements obtained at shorter infrared wavelengths and same luminosity phase. Extended optically thin close-by dust shells characterized by Infrared Spatial Interferometer measurements are not found to play a significant role in the observed L band intensity distribution. Gas properties are likely to have a greater impact at these wavelengths. Our o Ceti interferometric observations look indeed in good agreement with the presence of very extended circumstellar gas layers (mostly H2O and SiO) derived from recent Infrared Space Observatory thermal infrared spectral data.

Paper Details

Date Published: 5 July 2000
PDF: 10 pages
Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390243
Show Author Affiliations
Bertrand P. Mennesson, Univ. of Leiden (United States)
Guy S. Perrin, Observatoire de Paris (France)
Vincent Coude du Foresto, Observatoire de Paris (France)
Gilles Chagnon, Observatoire de Paris (France)
Cyril Ruilier, Observatoire de Paris (France)
Sebastien Morel, Harvard-Smithsonian Ctr. for Astrophysics (Germany)
Stephen T. Ridgway, National Optical Astronomy Observatories (United States)
Bruno Lopez, Observatoire de la Cote d'Azur (France)
Patrick de Laverny, Observatoire de la Cote d'Azur (France)
Wesley A. Traub, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Nathaniel P. Carleton, 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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