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Proceedings Paper

Observations of MIRA stars with the IOTA/FLUOR interferometer and comparison with MIRA star models
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Paper Abstract

We present K-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner which provides high- accuracy visibility measurements in spite of time-variable atmospheric conditions. For the Mira stars X Oph, R Aql, RU Her, R Ser, and V CrB we derived the uniform-disk diameters 11.7 mas, 10.9 mas, 8.4 mas, 8.1 mas, and 7.9 mas (+/- 0.3 mas), respectively. Simultaneous photometric observations yielded the bolometric fluxes. The derived angular Rosseland radii and the bolometric fluxes allowed the determination of effective temperatures. For instance, the effective temperature of R Aql was determined to be 3072 K +/- 161 K. A Rosseland radius for R Aql of 250 R. +/- 63 R. was derived from the angular Rosseland radius of 5.5 mas +/- 0.2 mas and the HIPPARCOS parallax of 4.73 mas +/- 1.19 mas. The observations were compared with theoretical Mira star models (D/P model Rosseland radius equals 255 R.; measured R Aql Rosseland radius equals 250 R. +/- 63 R.).

Paper Details

Date Published: 5 July 2000
PDF: 8 pages
Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390270
Show Author Affiliations
Karl-Heinz Hofmann, Max-Planck-Institut fuer Radioastronomie (Germany)
Udo Beckmann, Max-Planck-Institut fuer Radioastronomie (Germany)
Thomas Bloecker, Max-Planck-Institut fuer Radioastronomie (Germany)
Vincent Coude du Foresto, Observatoire de Paris-Meudon (France)
Marc G. Lacasse, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Rafael Millan-Gabet, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Sebastien Morel, Harvard-Smithsonian Ctr. for Astrophysics (Germany)
B. Pras, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Cyril Ruilier, Observatoire de Paris-Meudon (France)
Dieter Schertl, Max-Planck-Institut fuer Radioastronomie (Germany)
Michael Scholz, Univ. Heidelberg (Germany)
Victor Shenavrin, Sternberg Astronomical Institute (Russia)
Wesley A. Traub, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Gerd Weigelt, Max-Planck-Institut fuer Radioastronomie (Germany)
Markus Wittkowski, Max-Planck-Institut fuer Radioastronomie (Chile)
Boris Yudin, Sternberg Astronomical Institute (Russia)

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

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