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A Set of Grisms for FORS

Published online by Cambridge University Press:  12 April 2016

W. Fürtig  and
W. Seifert
W. Fürtig
Affiliation:
Landessternwarte, Künigstuhl, D-69117 Heidelberg
W. Seifert
Affiliation:
Landessternwarte, Künigstuhl, D-69117 Heidelberg

Extract

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The University Observatories of München and Göttingen and the Landessternwarte Heidelberg are building in cooperation with ESO two almost identical FOcal Reducer /low-dispersion Spectrographs (FORS) for the ESO Very Large Telescopes. FORS allows low-dispersion multiobject spectroscopy (19 slits) and longslit spectroscopy in the wavelength range of 330 to 1100 nm. A set of standard grisms with reciprocal dispersions of 45 ...230 Å/mm working in the first order are foreseen. With a slitwidth of 1 arcsec the resulting spectral resolutions range from 180 to 1800.

For further FORS details see Appenzeller and Rupprecht (1992) and Seifert et al. (1994).

The standard grisms are located in a grism wheel in the parallel beam between the collimator and the camera. Seven of eight positions are available for grisms. The free diameter of the grisms is 135 mm to cover the whole field of view of FORS. To avoid reflection ghosts the entrance surfaces are all tilted by .

Type
1. Basic Principles, Focal Reducers
Information
International Astronomical Union Colloquium , Volume 149: Tridimensional Optical Spectroscopic Methods in Astrophysics , 1995 , pp. 27 - 28
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Appenzeller, I. and Rupprecht, G. 1992, The Messenger, 67, 18 Google Scholar
Seifert, W., Mitsch, W., Nicklas, H. and Rupprecht, G. 1994, in Proc. SPIE 2198, Crawford, D.L. and Craine, E.R. (eds.), 1994, in pressGoogle Scholar