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The radial velocity (RV) of a single star is easily obtained fromcross-correlation of the spectrum with a template, but the treatment ofdouble-lined spectroscopic binaries (SB2s) is more difficult. Two differentapproaches were applied to a set of SB2s: the fit of the cross-correlationfunction with two normal distributions, and the cross-correlation with twotemplates, derived with the TODCOR code. It appears that the minimum massesobtained through the two methods are sometimes rather different, although theirestimated uncertainties are roughly equal. Moreover, both methods induce ashift in the zero point of the secondary RVs, but it is less pronounced forTODCOR. All-in-all the comparison between the two methods is in favour ofTODCOR.

On the derivation of radial velocities of SB2 components: a "CCF vs TODCOR" comparison