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Proceedings Paper

Interferometric spectrometer for liquid mirror survey telescopes
Author(s): Kjetil Dohlen
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Paper Abstract

A new application for the technique of holographic Fourier transform spectroscopy [Stroke and Funkhauser, Phys. Lett. 16, 272 (1965)] is presented. We propose placing a Michelson interferometer in the focal plane of a zenith-looking liquid mirror telescope [Borra et al., this conference]. A wedge whose apex runs perpendicular to the star drift direction is introduced between the two arms creating a variation in the star's apparent intensity due to interference as it drifts across the focal plane. The record of this intensity variation is the interferogram of the star, i.e. the Fourier transform of its spectrum. Imaging the mirrors of the Michelson onto a CCD array thus allows simultaneous spectral measurements of numerous sources. We present calculations indicating that a limiting magnitude of 18.6 may be reached with a spectral sampling of 4 A covering from 5000 A to 9000 A by summing 100 nights of observations.

Paper Details

Date Published: 21 March 1997
PDF: 6 pages
Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); doi: 10.1117/12.269028
Show Author Affiliations
Kjetil Dohlen, Observatoire de Marseille (France)

Published in SPIE Proceedings Vol. 2871:
Optical Telescopes of Today and Tomorrow
Arne L. Ardeberg, Editor(s)

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