ROTATION PERIODS OF SELECTED MEMBERS OF THE ALPHA-PERSEI CLUSTER .2.

We present the results of a photometric monitoring programme of nine G -K dwarf members of the young open cluster surrounding alpha Persei. T he aim of this programme was to measure the axial rotation periods of five rapid rotators (v sin i > 50 km s(-1)) and four slow rotators (v sin i less than or equal to 10 km s(-1)) to further our study of the d istribution of rotation rates of the low-mass population of the cluste r. We successfully measured accurate rotation periods for all of the f ive rapid rotators, most of which exhibited significant rotational mod ulation. In contrast the slow rotators exhibited light curve amplitude s below the threshold of photometric detectability. We applied a forma l statistical analysis to our data and found strong evidence for varia bility (Delta V similar to 0.03 mag) in only one of the slow rotating targets.