FOS Cycle 3 Wavelength Calibration: Internal/external Offsets

Details FOS Cycle 3 Wavelength Calibration: Internal/external Offsets FOS Cycle 3 Wavelength Calibration: Internal/external Offsets

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.5049k&link_type=abstract

HST Proposal ID #5049

Physics

Hst Proposal Id #5049

Scientific paper

The Cycle 2 internal/external wavelength calibration for grating G130H was not adequate due to lack of lines in the external source spectrum. A new source with a strong G130H emission line spectrum is observed in this region. Both the original Cycle 2 source and the new source are also observed with G190H on both sides to insure 1.) the new source is tied to the original system, and 2.) no instrumental change has occurred since the Cycle 2 observa- tions. This test will be performed using the 0.3" aperture and two external sources. Derived offsets can be applied to the polynomial fit of pixel number versus wavelength determined from the lines in the internal Pt/Cr-Ne lamp. Internal sources make up a small fraction of the exposure time and must be acquired at the same time as the external sources, so they can NOT be scheduled as parallel observations.

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