CHARA angular diameter measurements with a 330 meter baseline

Stephen T. Ridgway; Theo Armand ten Brummelaar; William G. Bagnuolo Jr.; David H. Berger; Anders Jerkstrand; Harold A. McAlister; Laszlo Sturmann; Judit Sturmann; Mark A. Shure; Nils Henning Turner

doi:10.1117/12.459140

21 February 2003 CHARA angular diameter measurements with a 330-meter baseline

Stephen T. Ridgway, Theo Armand ten Brummelaar, William G. Bagnuolo Jr., David H. Berger, Anders Jerkstrand, Harold A. McAlister, Laszlo Sturmann, Judit Sturmann, Mark A. Shure, Nils Henning Turner

Author Affiliations +

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.459140
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

During the 2001 observing season, the CHARA Array was in regular operation for a combined program of science, technical development, test, and commissioning. Interferometric science operations were carried out on baselines up to 330 meters -- the maximum available in the six-telescope array. This poster gives sample results obtained with the approximately north-south telescope pair designated S1-E1. At operating wavelengths in the K band, the 330 m baseline is well suited to diameter determinations for angular diameters in the range 0.6 - 1.2 milliarcseconds. This is a good range for study of a wide range of hot stars. In this poster, angular diameters for a set of A,B and F stars are compared to results derived from other sources. These confirm CHARA performance in the range 3-10% in visibility. The normal stars follow a normal spectral type - surface brightness relation, and a classical Be star deviates from the norm by an amount consistent with its apparent colors.

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Stephen T. Ridgway, Theo Armand ten Brummelaar, William G. Bagnuolo Jr., David H. Berger, Anders Jerkstrand, Harold A. McAlister, Laszlo Sturmann, Judit Sturmann, Mark A. Shure, and Nils Henning Turner "CHARA angular diameter measurements with a 330-meter baseline", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.459140

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