The primary reference for the Copernicus Spectral Atlas of Beta
Orionis is Rogerson, J. B. and Upson, Walter L.,
The summary information that follows is taken from that reference.
The observations obtained to construct this atlas were obtained primarily
during the periods between 1974 December 3-17. Additional observations
were obtained on 1975 January 19 to replace some unusable measurements.
The spectral atlas covers wavelengths from 999.3 Å to 1420.1 Å
(second order) and 1416.5 Å to 1561.1 Å (first order), with a
spectral resolution of 0.1 Å in first order and 0.05 Å in
second order. The scans were made in the U1 detector. A complete
description of the Copernicus science instrument may be found in
Rogerson et al.(1973ApJ...181L..97R)
Wavelengths were corrected for Doppler shifts due to (a) the heliocentric
radial velocity of Beta Ori, (b) the Earth's heliocentric velocity in the
direction of Beta Ori, and (c) the component of the satellite geocentric
orbital velocity in the direction of Beta Ori. 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 29 separate scans of specific spectral
regions. There are a total of two files relating to the Beta Ori Spectral
Atlas. File 1 is the 2nd order continuum and estimated scattered light,
and file 2 is the first order continuum and estimated scattered light.
FILENAME ROWS FIELDS WVE_FRST WVE_LST TYPE
betaori1.fts 19987 6 999.281 1420.151 2nd order
betaori2.fts 2779 6 1416.514 1561.120 1st order