“…The α Per data are a compilation of the results from Stauffer et al (1985), Stauffer, Hartmann & Jones (1989), Prosser (1991), Prosser et al (1993a,b, 1995), O'Dell & Collier Cameron (1993), O'Dell, Hendry & Collier Cameron (1994), O'Dell at al. (1996), Allain et al (1996), Martín & Zapatero Osorio (1997), Prosser & Randich (1998), Prosser, Randich & Simon (1998) and Barnes et al (1998), and the Hyades data from Radick et al (1987) and Prosser et al (1995), taken from the open cluster data base.…”