Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..521d&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 521-524 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Calibrating, Echelette Gratings, Emission Spectra, Iue, Stellar Spectrophotometry, Wavelengths, Computer Techniques, Data Reduction, Radial Velocity, Statistical Analysis, Velocity Measurement
Scientific paper
Sources of random and systematic errors in the echelle wavelength scales that must be minimized in order to obtain high quality radial velocity measurements of emission lines in the far UV with IUE are reviewed. The problem of overexposure of the strongest Pt II emission lines at the long wavelength end of the spectrum and the faintness of the remaining Pt II emission features is also examined. Wavelength calibration spectra from IUE archives were analyzed using an interactive procedure incorporating a least squares Gaussian fitting algorithm. The standard deviation of the PHCAL wavecals (+/- 1.1 km/sec using 1982 data only) is less than was found for the 6 wavecals (+/- 3.1 km/sec) obtained on consecutive days in December of 1982 in a previous study nearly contemporaneous wavecals to register velocity scales of stellar high dispersion observations. The standard deviation of the mean residuals of the orders averaged over 1982 is 2.2 km/sec, which can be interpreted as the internal consistency of the IUE SW wavelength scales.
Ayres Thomas R.
Delapana M. D.
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