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DAOSPEC is a Fortran code for measuring equivalent widths of absorption linesin stellar spectra with minimal human involvement. It works with standard FITSformat files and it is designed for use with high resolution (R>15000) and highsignal-to-noise-ratio (S/N>30) spectra that have been binned on a linearwavelength scale. First, we review the analysis procedures that are usuallyemployed in the literature. Next, we discuss the principles underlying DAOSPECand point out similarities and differences with respect to conventionalmeasurement techniques. Then experiments with artificial and real spectra arediscussed to illustrate the capabilities and limitations of DAOSPEC, withspecial attention given to the issues of continuum placement; radialvelocities; and the effects of strong lines and line crowding. Finally,quantitative comparisons with other codes and with results from the literatureare also presented.

DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra