Rotational velocities of A-type stars II.

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 derive vsini from the frequency of the first zero.

Statistical analysis of the sample indicates that measurement error mainly depends on vsini and this relative error of the rotational velocity is found to be about 5% on average. The systematic shift with respect to standard values from Slettebak et al. (1975ApJS...29..137S), previously found in the first paper, is here confirmed. Comparisons with data from the literature agree with our findings: vsini values from Slettebak et al. are underestimated and the relation between both scales follows a linear law vsini(new)=1.03*vsini(old)+7.7.