NASA ADS Astronomy Abstract Service

Title:
L'-Band Interferometric Observations of Evolved Stars
Authors:
Chagnon, G.; Mennesson, B.; Perrin, G.; Coudé du Foresto, V.; Salomé, P.; Bordé, P.; Lacasse, M.; Traub, W.
Affiliation:
AA(Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon, France; Gilles.Chagnon@obspm.fr), AB(Jet Propulsion Laboratory, MS 306-388, California Institute of Technology, 4800 Oak Grove Drive, Pasadena CA 91109), AC(Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon, France), AD(Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon, France), AE(Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon, France), AF(Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon, France), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138)
Journal:
The Astronomical Journal, Volume 124, Issue 5, pp. 2821-2832. (AJ Homepage)
Publication Date:
11/2002
Origin:
UCP
AJ Keywords:
Stars: AGB and Post-AGB, Stars: Late-Type, Techniques: Interferometric
Abstract Copyright:
(c) 2002: The American Astronomical Society
Bibliographic Code:
2002AJ....124.2821C

Abstract

Ten bright Miras, six semiregular variable giants, and two semiregular variable supergiants have been observed with the Infrared-Optical Telescope Array interferometer in the L' band (from 3.4 to 4.1 ìm). Observations were carried out in 2000 March and November with the FLUOR/TISIS instrument, using optimized single-mode waveguides for optical recombination and a dedicated chopping system for accurate subtraction of slow thermal background drifts. Four of the sources (the Mira stars R Leo and R Cnc, á Ori, and RS Cnc) were observed in both runs. We report on visibility measurements and derive L' broadband uniform disk (UD) diameter best fits for all 18 stars in our sample. We also detect strong departures from UD models in some peculiar cases.