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Proceedings Paper

Deep fiber spectroscopy
Author(s): Ian Robert Parry; Esperanza Carrasco
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Paper Abstract

Techniques for improving the subtraction of sky background when performing multiobject spectroscopy with fiber-optic-link instruments are examined analytically and by means of numerical simulations. The sky subtraction problems for multislit, long-slit, and fiber-optic spectroscopy are compared; the detrimental effects of fiber misalignment, poor-quality fiber end preparation, stress-related focal-ratio degradation, absorption losses, and connector losses are described; and consideration is given to improvements based on (1) using higher-quality fibers, (2) allowing for wavelength-dependent differences in fiber response, and (3) mimicking the multislit method by allocating more fibers to each object. The effects of vignetting and parameter shifts on computer-simulated spectra are shown in graphs.

Paper Details

Date Published: 1 July 1990
PDF: 7 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19133
Show Author Affiliations
Ian Robert Parry, Univ. of Durham (United Kingdom)
Esperanza Carrasco, Univ. of Durham (Mexico)


Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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