Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....5..329f&link_type=abstract
Experimental Astronomy, Volume 5, Issue 3-4, pp. 329-354
Astronomy and Astrophysics
Astronomy
Spectrograph, Multi-Object-Spectroscopy, M15
Scientific paper
We describe the multislit spectrograph “SFM”. It is designed to obtain simultaneously spectrograms of faint objects over a field of 10 arcminutes for an entrance aperture ratio f/10, or of 15 arcmin for f/8. The SFM makes the dispersed image of the entrance slits directly, without any fiber optics. The number of entrance slits can be as large as a few hundreds, depending on the distribution of the sources on the sky and on the wavelength range. The present reciprocal dispersion is 79Åmm-1 in the wavelength range 3600 6400Å. The SFM is expected to reachm v≈22 with a signal to noise ratio of 10 for a spectral resolution of 3.3Å and an integration time of 5 hours, when used with the photon counting detector CP40. Radial velocities can be measured either by using calibration spectrograms or by the objective prism technique. The mask of entrance slits is made photochemically from a plate previously recorded of the field to be observed, taken during the same observing run. The auxiliary equipment Mascograph, specially designed for this purpose, is described. First spectrograms in the field of M15 obtained with the SFM using the Calar-Alto 3.50m telescope are presented.
Baranne Andre
Bentolila C.
Blazit Alain
Foy Françoise Claude
Foy Renaud
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