Internal Wavelength Calibration

Details Internal Wavelength Calibration Internal Wavelength Calibration

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4212b&link_type=abstract

HST Proposal ID #4212

Physics

Hst Proposal Id #4212

Scientific paper

Since the internal wavelength calibration exposures (WAVECALS) have been removed from most of the cycle 2 calibration programs, this separate proposal is needed to monitor the stability of the FOS wavelength scale. All standard gratings are used with the 0.3"circle and either the 0.1" or 0.25" paired apertures. The WAVECAL lamp has a fairly constant output, so that these data are a secondary monitor of any changes in the FOS internal sensitivity. The program can be scheduled as an interleaver observation and should be repeated every 2 months for a total of 6 times.

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