Diffraction-limited imaging with ground-based optical telescopes
The construction of diffraction-limited images with ground-based optical telescopes by means of closure-phase observations is explored. The effect of redundant baselines on closure-phase observations is analyzed, and it is shown that for bright objects a nonredundant-mask approach is superior to the use of the full aperture. Observations of closure phase with a nonredundant mask on the 200 in. Hale Telescope are presented, and compared with the predictions of atmospheric seeing theory. It is demonstrated that fairly complex images can be constructed from closure-phase observations alone.
Additional Information© 1988 American Astronomical Society. Received 15 July 1987; revised 29 December 1987. We thank T. J. Cornwell, S. Kulkarni, and P. N. Wilkinson for useful discussions, and the staffs at Palomar Observatory and the Owens Valley Radio Observatory for their assistance. We also thank the referee for constructive comments and suggestions. This work was supported in part by grants AST85-09822 and AST86-13059 from the National Science Foundation and by a grant from the W. M. Keck Foundation.
Published - 1988AJ_____95_1278R.pdf