Rotation and activity in the solar-type stars of NGC 2547

We present high-resolution spectroscopy of a sample of 24 solar-type stars in the young (15-40 Myr), open cluster NGC 2547. We use our spectra to conf irm cluster membership in 23 of these stars, to determine projected equator ial velocities and chromospheric activity, and to search for the presence o f accretion discs. We find examples of both fast (v(e) sin i > 50 km s(-1)) and slow (v(e) sin i < 10 km s(-1)) rotators, but no evidence for active a ccretion in any of the sample. The distribution of projected rotation veloc ities is indistinguishable from the slightly older IC 2391 and IC 2602 clus ters, implying similar initial angular momentum distributions and circumste llar disc lifetimes. The presence of very slow rotators indicates either th at long (10-40 Myr) disc lifetimes or internal differential rotation are ne eded, or that NGC 2547 (and IC 2391/2602) were born with more slowly rotati ng stars than are presently seen in even younger clusters and associations. The solar-type stars in NGC 2547 follow a similar rotation-activity relati onship to that seen in older clusters. X-ray activity increases until a sat uration level is reached for v(e) sin i > 15-20 km s(-1). We are unable to explain why this saturation level, of log(LxLbol)similar or equal to-3.3, i s a factor of 2 lower than in other clusters, but rule out anomalously slow rotation rates or uncertainties in X-ray flux calculations.