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Feeding the Coude‚ Spectrograph with the 2.1-m...(1Jun92)
Telescope
(from KPNO, NOAO Newsletter No. 30, 1 June 1992)

The Coude Spectrograph is almost always used in conjunction with the
0.9-m Coude Feed telescope, but we wish to remind you that this is not a
strict requirement. The Coude Spectrograph can also be used with the
2.1-m telescope; if your scientific program would benefit from this
combination, we will be happy to receive a proposal for this
configuration. However, you should bear in mind the fact that the
Spectrograph and 2.1-m is no more than half a magnitude faster than the
Spectrograph and Feed. This is because slit losses are greater given
the factor of 2.3 larger plate scale and because the 2.1-m telescope's
five mirror coud train loses more light and produces poorer images than
the three mirror Feed system. So if one assumes at most a factor of 2
faster and then factors in the extra setup time involved in using the
2.1-m, there may be a very limited range of programs that would benefit
in a significant way.

David De Young

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