The slender Coudé
Tower accompanying the 2.1-meter telescope
is part of a special auxiliary system
which, coupled with a separate mirror housed in a rectangular
shed, enables spectroscopic work to be performed independently
of the main telescope, effectively making the 2.1-meter telescope
a dual observing facility. This separate system feeds light to
Spectrograph, a large instrument built into the square building
underneath the mirror shed. For obvious reasons, this is known
as the Coude Feed telescope.
The feed has contributed
to astronomical research in its application of spectroscopy
of stars including spectral classification, stellar abundances,
radial velocity curves of binary and variable stars, and spectrophotometric
studies of variable stars.