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arXiv:astro-ph/0004013 (astro-ph)
[Submitted on 3 Apr 2000]

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

Authors:K.-H. Hofmann (1), U. Beckmann (1), T. Bloecker (1), V. Coude du Foresto (2), M. Lacasse (3), R. Millan-Gabet (3), S. Morel (3), B. Pras (3), C. Ruilier (2), D. Schertl (1), M. Scholz (4), V. Shenavrin (5), W. Traub (3), G. Weigelt (1), M. Wittkowski (1), B. Yudin (5) ((1) MPI fuer Radioastronomie, Bonn; (2) Observatoire de Paris-Meudon; (3) Harvard-Smithsonian Center for Astrophysics; (4) Institut fuer Theoretische Astrophysik, Heidelberg; (5) Sternberg Astronomical Institute, Moscow)
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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 Rsun +/- 63 Rsun 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 of Bessel, Scholz and Wood (1996) and Hofmann, Scholz and Wood (1998).
Comments: 8 pages, 3 figures, see this http URL, SPIE conf 4006 "Interferometry in Optical Astronomy", in press
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0004013
  (or arXiv:astro-ph/0004013v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0004013
Related DOI: https://doi.org/10.1117/12.390270

Submission history

From: Karl-Heinz Hofmann [view email]
[v1] Mon, 3 Apr 2000 10:03:55 UTC (26 KB)
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