Title:
Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models
Authors:
Hofmann, K.-H.; Beckmann, U.; Blöcker, T.; Coudé du Foresto, V.; Lacasse, M.; Mennesson, B.; Millan-Gabet, R.; Morel, S.; Perrin, G.; Pras, B.; Ruilier, C.; Schertl, D.; Schöller, M.; Scholz, M.; Shenavrin, V.; Traub, W.; Weigelt, G.; Wittkowski, M.; Yudin, B.
Affiliation:
AA(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany), AB(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany), AC(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany), AD(Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195, Meudon Cedex, France), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,, Cambridge, MA 02138, USA), AF(Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195, Meudon Cedex, France), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,, Cambridge, MA 02138, USA), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,, Cambridge, MA 02138, USA), AI(Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195, Meudon Cedex, France), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,, Cambridge, MA 02138, USA), AK(Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195, Meudon Cedex, France), AL(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany), AM(ESO Garching, Karl-Schwarzschild-Str. 2, 85748 Garching bei München,, Munich, Germany), AN(Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstr. 15, 69121, Heidelberg, Germany), AO(Sternberg Astronomical Institute, Universitetskii pr. 13, 119899, Moscow, Russia), AP(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,, Cambridge, MA 02138, USA), AQ(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany), AR(ESO Garching, Karl-Schwarzschild-Str. 2, 85748 Garching bei München,, Munich, Germany), AS(Sternberg Astronomical Institute, Universitetskii pr. 13, 119899, Moscow, Russia)
Journal:
New Astronomy, Volume 7, Issue 1, p. 9-20. (NewA Homepage)
Publication Date:
01/2002
Origin:
ELSEVIER
Abstract Copyright:
(c) 2001 Elsevier Science B.V.
Bibliographic Code:
2002NewA....7....9H

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 M-type Miras X Oph, R Aql, RU Her, R Ser, and the C-type Mira 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 2970/+/-110 K. A linear Rosseland radius for R Aql of 250+100-60Rsolar was derived from the angular Rosseland radius of 5.5+/-0.2mas and the HIPPARCOS parallax of 4.73+/-1.19mas. The observations were compared with theoretical Mira star models of Bessel et al. [AA 307 (1996) 481] and Hofmann et al. [AA 339 (1998) 846]. The effective temperatures of the M-type Miras and the linear radius of R Aql indicate fundamental mode pulsation.