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TUES Data Products

There are basically 3 types of files produced by the TUES project:

  • Raw image files,
  • Single Order Extracted files,
  • Multiple Order Extracted files.
Clicking on the section titles will display more detailed information.

Image Files

The TUES image files contain the raw image of the TUES echelle spectrum. The image is stored as a primary array FITS file containing a 1024 x 512 2-byte integer array in units of counts/pixel. The raw image file names will be in the form TUESnnnn_m.fits where nnnn is the target ID number, and m is the observation number.

Single Order Extracted Spectrum Files

The extracted flux data from each extracted order were written to separate FITS binary table files. File names are in the form TUESnnnn_m_ORDx.fits where nnnn and m are defined as for the raw image files, and x is the number of the extracted order.

The single order extracted spectra are also available as ASCII table files. Before the FITS files were available, these files were the official data sets produced by the project, and the included data is identical in both (minus the FITS header information.) The individual order ASCII files can be downloaded from the individual preview pages, or via the web at: https://archive.stsci.edu/missions/tues/previews/txt/

Multiple Order Extracted Spectrum Files

By storing multiple binary table extensions in one FITS file, the data from all the extracted orders for a given observation were stored in one FITS files. These files typically have roughly 22 binary table extensions with data from each order stored as a separate extension. The data within each extension is identical to that stored in the single order spectrum files. File names are in the form TUESnnnn_m_spectrum.fits.

In addition, the MAST staff have produced quick-look ASCII table files containing the merged fluxes and wavelengths from all the extracted orders for each TUES observation. The splice points correspond to the point where the difference in the blaze correction in adjacent orders is a minimum, and are listed in the header of the ASCII file. The wavelengths in Angstroms and fluxes in ergs/cm2/s/A follow the header starting in line 42. The gzipped files are downloadable from the preview page and use the naming convention tuesnnn_m.txt.gz.