Coronagraph for astronomical imaging and spectrophotometry

Details Coronagraph for astronomical imaging and spectrophotometry Coronagraph for astronomical imaging and spectrophotometry

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26..664v&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 26, Feb. 15, 1987, p. 664-668.

Physics

Optics

10

Astronomical Photography, Coronagraphs, Optical Paths, Spectrophotometry, Telescopes, Cassegrain Optics, Image Resolution, Mirrors, Scattering Amplitude

Scientific paper

A coronagraph designed to minimize scattered light in astronomical observations caused by the structure of the primary mirror, secondary mirror, and secondary support structure of a Cassegrainian telescope is described. Direct (1:1) and reducing (2.7:1) imaging of astronomical fields are possible. High-quality images are produced. The coronagraph can be used with either a two-dimensional charge-coupled device or photographic film camera. The addition of transmission dispersing optics converts the coronagraph into a low-resolution spectrograph. The instrument is modular and portable for transport to different observatories.

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