Data Pipelines for the TRES Echelle Spectrograph
The Tillinghast Reflector Echelle Spectrograph (TRES) is a two-fiber (object and sky spectra) optical echelle spectrograph on the 1.5-meter Tillinghast telescope at the Smithsonian Astrophysical Observatory's Fred L. Whipple Observatory on Mt. Hopkins in Arizona. An IRAF-based processing pipeline has been written to reduce spectra keeping the maximum wavelength precision, which varies from 0.03 to 0.07 Angstroms/pixel over 51 orders covering a range of 3850 to 9100 Angstroms. A major design goal was to use the same software at the telescope for quick-look real-time processing and, with relatively few parameter changes, reduction with more accuracy for scientific processing. A modular system was written in IRAF for portability and simplicity, so that scientists can re-reduce their data in various ways to optimize its quality for their needs. Using IRAF allowed recycling and adaptation of tasks developed for SAO's FAST long-slit and Hectospec multi-fiber spectrographs, as well as NOAO-developed echelle tasks.
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