FOS Cycle 6 - Internal/external Offset

Physics

Scientific paper

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Hst Proposal Id #6918

Scientific paper

Offsets between internal and external wavelength scaleswill be measured for 4 gratings on the blue side andfor 5 gratings on the red side. This test will beperformed using the 0.3" aperture and two externalsources. Derived offsets can be applied to the polyn-omial fit of pixel number versus wavelength determinedfrom the lines in the internal Pt/Cr-Ne lamp. Internalsources make up a small fraction of the exposure timeand must be acquired at the same time as the externalsources, so they can NOT be scheduled as parallelobservations.

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