Wavelength Calibration: Internal/external Offsets

Details Wavelength Calibration: Internal/external Offsets Wavelength Calibration: Internal/external Offsets

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3316d&link_type=abstract

HST Proposal ID #3316

Physics

Hst Proposal Id #3316

Scientific paper

Offsets between internal and external wavelength scales will be measured in SV for 3 gratings on the blue side and for 6 gratings on the red side. This test will be performed using the 0.3",4.3",0,5", and 0.25" x 2.0" aperture and one external source. 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. Unresolved lines in a dMe star will be used to determine the FOS + ST Line Spread Function. The internal sources make up only 5% of the exposure time and must be acquired at the same time as the external sources, so they cannot be scheduled as parallel observations.

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