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The Cassegrain adapter holding the SOPHIE fiber heads is shown here parked
on the side of the telescope tube. At the time this picture was taken, the
CARELEC long-slit spectrograph was mounted at the Cassegrain focus. The four
fibers in their gray sheaths travel through the telescope
structure and go down to the thermally-controlled enclosure in the observing
room (the old Coudé room) through the polar axis. A fourth unsheathed
(orange) fiber can be used for a Fabry-Perot ELODIE add-on.
At the top of the adapter are seen the
calibration lamps: Tungsten (small lamp) and Thorium (large lamp).
One of the two fibers is used for the star and the other either for the
sky spectrum, to correct the cross-correlation profile for the
effects of moonlight, or for a Thorium wavelength calibration.
The CCD autoguider, which was mounted on CARELEC when the picture was taken,
goes on the side port at the right.
Click
on the image at the left for a larger view.
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