ZAMS Stars in Our Own Backyard: The Rotation-Activity Relation

摘要

We present chromospheric (Mg II lambda2800), transition region(C IVlambda1550), and L(sub x)(ROSAT) rotation-activity relations for a tiny, but homogeneous, sample of solar neighborhood K dwarf members of the Pleiades Moving Group. Stars with rotation periods approx. less than 3(sup d) show saturated TR emissions, but chromospheric emissions appear to be saturated at least out to P(sub rot) = 5(sup d).4. Coronal surface fluxes clearly depend on rotation for P(sub rot) approx. greater than 3(sup d); the situation for P(sub rot) approx less than 3(sup d) is unclear. We compare these results with recent studies of the Pleiades cluster.