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

Hofmann, K.-H. and Beckmann, U. and Blöcker, T. and Coudé du Foresto, V. and Lacasse, M. and Millan-Gabet, R. and Morel, S. and Pras, B. and Ruilier, C. and Schertl, D. and Scholz, M. and Shenavrin, V. and Traub, W. and Weigelt, G. and Wittkowski, M. and Yudin, B. (2000) Observations of MIRA stars with the IOTA/FLUOR interferometer and comparison with MIRA star models. In: Interferometry in Optical Astronomy. Proceedings of SPIE. No.4006. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 688-695. ISBN 9780819436313.

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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.).

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Lacasse, M.0000-0001-8627-9708
Millan-Gabet, R.0000-0003-0447-5866
Additional Information:© 2000 Society of Photo-optical Instrumentation Engineers (SPIE).
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:interferometry, Mira variables
Series Name:Proceedings of SPIE
Issue or Number:4006
Record Number:CaltechAUTHORS:20190118-073906971
Persistent URL:
Official Citation:Karl-Heinz Hofmann, Udo Beckmann, Thomas Bloecker, Vincent Coude du Foresto, Marc G. Lacasse, Rafael Millan-Gabet, Sebastien Morel, B. Pras, Cyril Ruilier, Dieter Schertl, Michael Scholz, Victor Shenavrin, Wesley A. Traub, Gerd Weigelt, Markus Wittkowski, 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
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92358
Deposited By: Tony Diaz
Deposited On:22 Jan 2019 04:29
Last Modified:16 Nov 2021 03:49

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