Rotational velocities of A-type stars ?;?? II. Measurement of vsin i in the northern hemisphere

This work is the second part of the set of measurements ofv sini for A-type stars, begun by Royer et al. (2002). Spectra of 249 B8 to F2-type stars brighter than V= 7 have been collected at Observatoire de Haute-Provence (OHP). Fourier transforms of several line profiles in the range 4200-4600 A are used to derivev sini from the frequency of the first zero. Statistical analysis of the sample indicates that measurement error mainly depends onv sini and this relative error of the rota- tional velocity is found to be about 5% on average. The systematic shift with respect to standard values from Slettebak et al. (1975), previously found in the first paper, is here con- firmed. Comparisons with data from the literature agree with our findings:v sini values from Slettebak et al. are underestimated and the relation between both scales follows a linear lawv sininew= 1:03v siniold+ 7:7. Finally, these data are combined with those from the previous paper (Royer et al. 2002), together with the catalogue of Abt & Morrell (1995). The resulting sample includes some 2150 stars with homogenized rotational velocities.