The Infrared Angular Diameter of Alpha Herculis Measured With a Michelson Interferometer

We present the first infrared angular diameter measurements of α Her, a bright cool supergiant. The measurements are the first astronomical scientific results from the infrared Michelson array (IRMA), a prototype near-infrared, broadband, two-telescope interferometer. Here we report on visibilities obtained with telescope separations of 4.8, 8.0, and 12.0 m. The data were fit with both uniform disk and limb darkened models.