The primary reference for the Copernicus Spectral Atlas of Vega
is Rogerson, J. B., (1989ApJS...71.1011R).
The summary information that follows is taken from that reference.
The observations used to construct this atlas were obtained during 1975
September 12-21 and 1975 September 27-October 7. Several gaps were filled
in on 1976 April 20. The spectral atlas covers wavelengths from 2000
Å to 3187 Å (first order), with a spectral resolution of 0.1
Å. The scans were made in the V1 detector. A complete description of
the Copernicus science instrument may be found in Rogerson et
Wavelengths were corrected for Doppler shifts due to (a) the heliocentric
radial velocity of Vega, (b) the Earth's heliocentric velocity in the
direction of Vega, and (c) the component of the satellite geocentric
orbital velocity in the direction of Vega. The counts from the source were
corrected for counts due to cosmic rays and trapped charge particles,
guiding errors and scattered light within the spectrometer. No correction
was made for the wavelength variations in the spectrometer sensitivity.
The atlas is a compilation of 23 separate scans of specific spectral
regions. There are four files relating to these observations. The file
numbers start at 2 following the original naming convention used at NSSDC.
File 2 contains the air spectrum; file 3 is the normalization continuum
and estimated scattered light; file 4 contains the equivalent flux values
in 20 Å intervals in ergs/cm²/s/Å; and file 5 contains
the table of line identifications.