Holography at the telescope - an interferometric method for recording stellar spectra in thick photographic emulsions

Details Holography at the telescope - an interferometric method for recording stellar spectra in thick photographic emulsions Holography at the telescope - an interferometric method for recording stellar spectra in thick photographic emulsions

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..241l&link_type=abstract

Astronomy and Astrophysics, vol. 67, no. 2, July 1978, p. 241-255. Research supported by the Swedish Natural Science Research C

Astronomy and Astrophysics

Astronomy

2

Astronomical Photography, Holography, Photographic Emulsions, Schmidt Telescopes, Stellar Spectra, Stellar Spectrophotometry, Bragg Angle, Focal Plane Devices, Fourier Transformation, Readout, Sky Surveys (Astronomy), Spectral Resolution, Star Distribution

Scientific paper

Low-resolution spectra (resolving power of no more than about 100) are recorded without any dispersive optics by direct focal-plane Lippmann photography using thick holographic emulsions. These record the Fourier transforms of the spectra, enabling spectrum reconstruction by reflected light and analysis with a microspectrophotometer. Since the spectral information is stored inside the emulsion and perpendicular to the holographic plate surface, problems with overlapping spectrograms in dense star fields are eliminated. Spectral resolution is set by emulsion thickness and is independent of seeing and telescope guiding. The holographic storage format appears suitable for automated spectral searches, and the future feasibility of a holographic spectral sky survey with Schmidt telescopes is suggested. Theoretical and experimental work is presented, and practical and theoretical limitations discussed.

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