Interferometric spectrometer for liquid mirror survey telescopes

Kjetil Dohlen

doi:10.1117/12.269028

21 March 1997 Interferometric spectrometer for liquid mirror survey telescopes

Kjetil Dohlen

Author Affiliations +

Proceedings Volume 2871, Optical Telescopes of Today and Tomorrow; (1997) https://doi.org/10.1117/12.269028
Event: Optical Telescopes of Today and Tomorrow, 1996, Landskrona/Hven, Sweden

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.

Citation Download Citation

Kjetil Dohlen "Interferometric spectrometer for liquid mirror survey telescopes", Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); https://doi.org/10.1117/12.269028

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