Interferometric spectrometer for liquid mirror survey telescopes

Details Interferometric spectrometer for liquid mirror survey telescopes Interferometric spectrometer for liquid mirror survey telescopes

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2871.1359d&link_type=abstract

Proc. SPIE Vol. 2871, p. 1359-1364, Optical Telescopes of Today and Tomorrow, Arne L. Ardeberg; Ed.

Physics

Scientific paper

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.

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