Publications
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MPIfR Optical & Infrared Interferometry Group

K.-H. Hofmann, U. Beckmann, T. Blöcker, V. Coude de Foresto, M. Lacasse, S. Morel, B. Pras, C. Ruilier, D. Schertl, M. Scholz, W. Traub, G. Weigelt, M. Wittkowski, and B. Yudin:

Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models

in Interferometry in Optical Astronomy, SPIE Conf. Vol. 4006, p. 688-695 (2000)

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 11.7mas, 10.9mas, 8.4mas, 8.1mas, and 7.9mas (+/- 0.3mas), 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 3072K +/- 161K. A Rosseland radius for R Aql of 250Rsol +/- 63Rsol was derived from the angular Rosseland radius of 5.5mas +/- 0.2mas and the HIPPARCOS parallax of 4.73mas +/- 1.19mas. The observations were compared with theoretical Mira star models of Bessel, Scholz and Wood (1996) and Hofmann, Scholz and Wood (1998) (D/P model Rosseland radius = 255Rsol; measured R Aql Rosseland radius = 250Rsol +/- 63Rsol).

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