The infrared angular diameter of Alpha Herculis measured with a Michelson interferometer

Abstract

view Abstract Citations (24) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Infrared Angular Diameter of Alpha Herculis Measured With a Michelson Interferometer Benson, J. A. ; Dyck, H. M. ; Mason, W. L. ; Howell, R. R. ; Ridgway, S. T. ; Dixon, D. J. Abstract The first infrared angular diameter measurements of Alpha Her, a bright cool supergiant are presented. The measurements are the first astronomical scientific results from the infrared Michelson array, a prototype near-infrared, broadband, two-telescope interferometer. Visibilities obtained with telescope separations of 4.8, 8.0, and 12.0 m are reported. The data were fit with both uniform disk and limb darkened models. It is found that the uniform disk angular diameter of Alpha Her at 2.2 microns is 32.2 +/-0.8 marcsec. By using the limb darkening models of Sholz and Takeda (1987) and the present angular diameter measurement, a stellar physical angular diameter of 34 +/-0.8 marcsec is derived. From this determined stellar angular diameter and a compilation of flux measurements from the literature, it is further determined that the effective temperature of Alpha Her is 3210 +/-40 K. Publication: The Astronomical Journal Pub Date: December 1991 DOI: 10.1086/116033 Bibcode: 1991AJ....102.2091B Keywords: Astrometry; Infrared Stars; Michelson Interferometers; Supergiant Stars; Angular Resolution; Diameters; Infrared Telescopes; Stellar Temperature; Astronomy; STARS: SUPERGIANTS; INTERFEROMETRY full text sources ADS | data products SIMBAD (10) Related Materials (1) Erratum: 1993AJ....105..736B