IRTF Spectral Library

The table below gives the stellar IDs, spectral types and data files that are part of the IRTF Spectral Library. Data files in both FITS and simple ascii (text) formats are available. (The FITS files can be read with the IDL GUIs found in the Spextool data reduction package.). Pdf and postscript plots of each star are also given. A tar file containing all the spectra for a given spectral type are also available. The entire IRTF library can be downloaded as a tar file in either FITS or text files ( pdf , ps ). We ask all users of these spectra to reference the original refereed publications listed below. Note some of the M dwarfs have two references.

Notes about the spectra:

• The spectra have all been absolutely flux calibrated using 2MASS photometry values. The uncertainty in the absolute level of the flux calibration is given in the header of each file.
• A few of the spectral types, particularly those for the early F stars, are subject to revision.
• Although obvious bad pixels have been removed, no smoothing has been done.
• The spectra have been shifted to zero radial velocity.
• Missing data are designated with -999 in the text files and NaN's in the FITS files.
• Regions of poor atmospheric transmission are marked on the plots with gray vertical bands.

The following papers discuss the spectrograph (SpeX) and the reduction methods and package (Spextool):

• SpeX instrument design: Rayner et al. 2003, PASP, 115, 362
• SpeX observing techniques:Rayner et al. 2004, SPIE 5492, 1498
• Spextool: Cushing, M. C., Vacca, W. D., & Rayner, J. T. 2004, PASP, 116, 362
• Telluric Corrections: Vacca, W. D., Cushing, M. C., & Rayner, J. T. 2003, PASP, 115, 389