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Stellar rotation is an important parameter in the evolution of massive stars.Accurate and reliable measurements of projected rotational velocities in largesamples of OB stars are crucial to confront the predictions of stellarevolutionary models with observational constraints. We reassess previousdeterminations of projected rotational velocities (vsini) in Galactic OB starsusing a large, high quality spectroscopic dataset, and a strategy which accountfor other sources of broadening appart from rotation affecting the diagnosticlines We present a versatile and user friendly IDL tool, based on a combinedFourier Transform (FT) + goodness of fit (GOF) methodology, for theline-broadening characterization in OB-type stars. We use this tool to (a)investigate the impact of macroturbulent and microturbulent broadenings onvsini measurements, and (b) determine vsini in a sample of 200 Galactic OB-typestars, also characterizing the amount of macroturbulent broadening (\vmacro)affecting the line profiles. We present observational evidence illustrating thestrengths and limitations of the proposed FT+GOF methodology for the case of OBstars. We confirm previous statements (based on indirect arguments or smallersamples) that the macroturbulent broadening is ubiquitous in the massive stardomain. We compare the newly derived vsini with previous determinations notaccounting for this extra line-broadening contribution, and show that thosecases with vsini< 120 km/s need to be systematically revised downwards by ~25(+/-20) km/s. We suggest that microturbulence may impose an upper limit belowwhich vsini and \vmacro\ could be incorrectly derived by means of the proposedmethodology as presently used, and discuss the implications of this statementon the study of relatively narrow line massive stars.

The IACOB project: I. Rotational velocities in Northern Galactic O and early B-type stars revisited. The impact of other sources of line-broadening