The Beta Orionis Spectral Atlas

The primary reference for the Copernicus Spectral Atlas of Beta Orionis is Rogerson, J. B. and Upson, Walter L., (1982ApJS...49..353R). 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.

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   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