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

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 −60  R ⊙ was derived from the angular Rosseland radius of 5.5±0.2 mas and the HIPPARCOS parallax of 4.73±1.19 mas. The observations were compared with theoretical Mira star models of Bessel et al. [A&A 307 (1996) 481] and Hofmann et al. [A&A 339 (1998) 846]. The effective temperatures of the M-type Miras and the linear radius of R Aql indicate fundamental mode pulsation.