Initial stellar diameter measurements with the Mark III interferometer

Details Initial stellar diameter measurements with the Mark III interferometer Initial stellar diameter measurements with the Mark III interferometer

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..905s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 905-910.

Statistics

14

Astrometry, Brightness Distribution, Diameters, Interferometers, Stellar Magnitude, Very Long Base Interferometry, Error Analysis, Laser Interferometry

Scientific paper

The paper reports initial stellar diameter measurements made with the Mark III stellar interferometer. The visibility measurements showed fluctuations of 1-3 percent for a 10 s integration consistent with photon statistics as the predominant source of noise. Measurements of the unresolved star Beta Tau were used to calibrate the instrumental and atmospheric biases which reduce the measured visibility. The paper reports angular diameters, at 706 nm, of 6.15 + or - 0.25 mas, 8.70 + or - 0.15 mas, 5.0 + or - 0.5 mas, and 7.2 + or - 0.4 mas rms for the stars Alpha CMi, Beta Gem, Alpha Per, and Alpha UMa, respectively. These angular diameters were calculated, assuming a uniform disk, from the visibility measurements, the wavelength of observation, and the projected interferometer baseline. The angular diameters corrected for limb darkening are also presented. In the next observing season, the instrument should be able to make very precise diameter measurements on a large number of stars brighter than 7 mag.

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