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Astronomical Optics, 2nd Edition
book

Astronomical Optics, 2nd Edition

by Daniel J. Schroeder
September 1999
Intermediate to advanced content levelIntermediate to advanced
478 pages
21h 54m
English
Academic Press
Content preview from Astronomical Optics, 2nd Edition
12.2.
Slit Spectrometers
e„
313
Fig. 12.8. Flux entering spectrometer entrance pupil. See Eq. (12.2.5).
Assuming 6^ is small we can replace sin 9^ by 6^. Substituting for w, h, and
6^ in terms of the telescope and spectrometer parameters gives
4 4 ^^
(12.2.7)
In this form we see that U is the product of
the
collimator (telescope) area S and
the solid angle Q subtended by the slit at the collimator (or by the slit on the sky).
It is also instructive to write U = nw9^
hO^. When written in this form, we
see from the discussion following Eq. (2.2.10) that U/n is the product of two
Lagrange invariants with n = I. Because the Lagrange invarian
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Publisher Resources

ISBN: 9780126298109