Abstract
We present near-infrared K-band interferometric measurements of the Mira star R Leonis obtained in April 2001 and January 2002 withVLTI/VINCI. The April 2001 measurements indicate a center-to-limb intensity variation (CLV) that is clearly different from a uniform disk (UD) intensity profile. We show that these measured visibility values are consistent with predictions from recent self-excited dynamic Mira model atmospheres. We derived high-precision Rosseland diameters for the two epochs and, together with literature estimates of the distance and the bolometric flux, we find linear radii of 350+50 -40 R_⊙ and 320+50 -40 R_⊙ andeffective temperatures of 2930 ± 270 K and 3080 ± 310 K, respectively.
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