5 July 2000 Observations of MIRA stars with the IOTA/FLUOR interferometer and comparison with MIRA star models
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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.).
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Karl-Heinz Hofmann, Karl-Heinz Hofmann, Udo Beckmann, Udo Beckmann, Thomas Bloecker, Thomas Bloecker, Vincent Coude du Foresto, Vincent Coude du Foresto, Marc G. Lacasse, Marc G. Lacasse, Rafael Millan-Gabet, Rafael Millan-Gabet, Sebastien Morel, Sebastien Morel, B. Pras, B. Pras, Cyril Ruilier, Cyril Ruilier, Dieter Schertl, Dieter Schertl, Michael Scholz, Michael Scholz, Victor Shenavrin, Victor Shenavrin, Wesley A. Traub, Wesley A. Traub, Gerd Weigelt, Gerd Weigelt, Markus Wittkowski, Markus Wittkowski, Boris Yudin, Boris Yudin, "Observations of MIRA stars with the IOTA/FLUOR interferometer and comparison with MIRA star models", Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390270; https://doi.org/10.1117/12.390270
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