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Proceedings Paper

Multitelescope telescope: a cost-effective approach to fiber-fed spectroscopy
Author(s): William G. Bagnuolo; Ingemar K. Furenlid; Douglas R. Gies; Donald J. Barry; William H. Russell; John F. Dorsey
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Paper Abstract

We describe a new spectroscopic facility based upon a novel Multi- Telescope Telescope (MTT) and a fiber optic fed spectrograph. The MTT is an inexpensive one meter light collecting telescope, whose "primary" mirror consists of nine commercially made amateur-size (33.3 cm) telescope mirrors. Each mirror of the MTT will focus light into a separate optical fiber, thus avoiding the light loss associated with the dead space in conventional fiber bundles. Throughput is further enhanced by low mirror obscuration and having only one reflection from the high reflectivity coatings available for smaller mirrors. The telescope is thus equivalent to about a 1.3-m conventional telescope for spectroscopy. The optical fibers will feed an off-plane Ebert-Fastie spectrograph with a COD detector. We conservatively estimate an overall optical efficiency of about 2.7% (4.4% without a slit at somewhat lower resolution), which corresponds to a limitirg magnitude of 9.4 for 1000 sec exposure, SNR=100, and a resolution of 0.2 A/pixel. By using a combination of an innovative structure, a control system, some existing materials, and donated shop time we can reduce the material cost of the telescope, spectrograph, and detector to about *35K to $55K, depending on the detector. The MTT and spectrograph will be installed at the newly commissioned Georgia State University Hard Labor Creek Observatory and will be used for spectroscopic observations of binaries and nonradial pulsations in Be stars.

Paper Details

Date Published: 1 July 1990
PDF: 8 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19187
Show Author Affiliations
William G. Bagnuolo, Georgia State Univ. (United States)
Ingemar K. Furenlid, Georgia State Univ. (United States)
Douglas R. Gies, Georgia State Univ. (United States)
Donald J. Barry, Georgia State Univ. (United States)
William H. Russell, Georgia Institute of Technology (United States)
John F. Dorsey, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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