Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1510n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, May 1989, p. 1510-1521. Research supported by the W. M. Keck Foundation.
Astronomy and Astrophysics
Astronomy
43
Binary Stars, Image Processing, Speckle Interferometry, Diffraction Patterns, Power Spectra, Signal To Noise Ratios, Synthetic Apertures, Very Long Base Interferometry
Scientific paper
The technique of nonredundant masking at the Hale 5-m telescope and radio VLBI imaging software are used to make optical aperture-synthesis maps of two binary stars, Beta Corona Borealis and Sigma Herculis. The dynamic range of the map of Beta CrB is about 50:1. For Sigma Her, a separation of 70 milliarcsec is found. These maps demonstrate the potential of the nonredundant masking technique for diffraction-limited imaging of astronomical objects with high dynamic range. The optimal integration time for measuring the closure phase is found to be longer than that for measuring the fringe amplitude. There is not a close relationship between amplitude errors and phase errors, and amplitude self-calibration is less effective at optical wavelengths than at radio wavelengths.
Ghez Andrea M.
Gorham Peter. W.
Kulkarni Sanjeev R.
Nakajima Tatsuya
Neugebauer Gernot
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