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| FAQ |
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Search & Retrieval |
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About Copernicus Data |
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Data Reduction & Analysis |
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HST and FUSE DADS retrievals will be down from Tuesday, September 2 through Wednesday Sept 3 for a DADS/OPUS installation. See list of alternative data sources. During part of this time, the database will also be down and so searches will be down during that time (HLA and GALEX are unaffected by this downtime).
The Tau Scorpii Spectral Atlas
![[Tau Sco Sample Spectrum]](/copernicus/images/tsplt.gif)
The observations obtained to construct this atlas were obtained primarily during the periods between 1973 July 2 and August 27. The spectral atlas covers wavelengths from 948 Å to 1420.6 Å (second order) and 1418.2 Å to 1560.2 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 Tau Sco, (b) the Earth's heliocentric velocity in the direction of Tau Sco, and (c) the component of the satellite geocentric orbital velocity in the direction of Tau Sco. 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 32 separate scans of specific spectral regions. There are a total of two files relating to the Tau Sco Spectral Atlas. File 1 is the 2nd order spectrum and file 2 is the first order spectrum.
ERRATUM: Note that there is a slight wavelength error in both file 2 and the published paper for wavelengths greater than 1499.9 Å. The corrected values are obtained using the relation
W(correct) = 1.0014523 * W(table) - 2.2656.
FILENAME ROWS FIELDS WVE_FRST WVE_LST TYPE tausco1.fts 21780 7 948.735 1420.510 2nd order tausco2.fts 2721 7 1418.187 1560.372 1st order
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