Computer Science
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ghrs.rept...39w&link_type=abstract
GHRS Instrument Science Report 039, 14 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Goddard High Resolution Spectrograph, Ghrs
Scientific paper
The wavelengths of Pt-Ne lines measured in GHRS wavelength calibration data have been compared with the tabulated wavelengths of the lines to derive the absolute accuracy of the routine pipeline calibration. For the first order gratings the maximum value of the observed-expected wavelength averaged over each range was a 0.09A. However the difference between the measured and standard wavelengths varies little between the individual ranges of each grating and with time, based on two sets of identical calibration data taken in January and May 1992. The reproducibility of the calibration implies that with a simple shift applied to the wavelength scale an accuracy of ~0.02A is achievable.
Analysis of the measured wavelengths of lines in one wavelength range of Echelle-B over a period of 1.3 days in January 1992 shows that routine accuracy of 0.03A is achieved by the pipeline calibration, and as for the first order gratings this offset is rather stable. However there is still some systematic drift of the wavelengths which can be correlated with temperature, implying that further improvements in pipeline calibration could lead to greater accuracy.
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