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 routines found in the Spextool package.) A tar file containing all the spectra for a given spectral type is also available. A postscript plot for each spectrum will be available shortly. Representative plots for each spectral type sequence, covering the entire wavelength range, are given below. We ask all users of these spectra to reference the original refereed publications listed below.

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 not yet been shifted to zero radial velocity. (This will be done shortly.)
• 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 postscript plots with gray vertical bands.

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

• SpeX: Rayner et al. 2003, PASP, 115, 362
• 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